10-letter words ending with US
Dive into the specific realm of 10-letter words that conclude with the letter US. This focused section reveals the fascinating ways in which words of this particular length, ending with US, contribute to the richness of the English language. Whether it's for expanding your vocabulary, solving puzzles, or simply for the love of words, discover how these terms uniquely blend length and ending sound.
| Word | Points | Definition | Sentence example |
|---|---|---|---|
| ridiculous | 13 | inspiring scornful pity | - |
| mysterious | 15 | of an obscure nature | the new insurance policy is written without cryptic or mysterious terms |
| suspicious | 14 | not as expected | suspicious behavior |
| tremendous | 13 | extreme in degree or extent or amount or impact | - |
| outrageous | 11 | greatly exceeding bounds of reason or moderation | spends an outrageous amount on entertainment |
| marvellous | 15 | too improbable to admit of belief | - |
| courageous | 13 | possessing or displaying courage; able to face and deal with danger or fear without flinching | a frank courageous heart...triumphed over pain |
| contagious | 13 | (of disease) capable of being transmitted by infection | - |
| rendezvous | 23 | a date; usually with a member of the opposite sex | - |
| auspicious | 14 | auguring favorable circumstances and good luck | an auspicious beginning for the campaign |
| continuous | 12 | continuing in time or space without interruption | a continuous rearrangement of electrons in the solar atoms results in the emission of light |
| miraculous | 14 | peculiarly fortunate or appropriate; as if by divine intervention | - |
| victorious | 15 | experiencing triumph | - |
| indigenous | 12 | originating where it is found | the Ainu are indigenous to the northernmost islands of Japan |
| prosperous | 14 | in fortunate circumstances financially; moderately rich | a prosperous family |
| disastrous | 11 | (of events) having extremely unfortunate or dire consequences; bringing ruin | the battle was a disastrous end to a disastrous campaign |
| infectious | 15 | caused by infection or capable of causing infection | - |
| rebellious | 12 | discontented as toward authority | - |
| horrendous | 14 | causing fear or dread or terror | horrendous explosions shook the city |
| nutritious | 10 | of or providing nourishment | - |
| scandalous | 13 | giving offense to moral sensibilities and injurious to reputation | scandalous behavior |
| meticulous | 14 | marked by precise accordance with details | meticulous research |
| monogamous | 15 | (used of relationships and of individuals) having one mate | monogamous marriage |
| fictitious | 15 | adopted in order to deceive | a fictitious address |
| capricious | 16 | determined by chance or impulse or whim rather than by necessity or reason | a capricious refusal |
| stupendous | 13 | so great in size or force or extent as to elicit awe | a stupendous field of grass |
| precarious | 14 | not secure; beset with difficulties | - |
| voluptuous | 15 | (of a woman's body) having a large bosom and pleasing curves | - |
| autonomous | 12 | (of political bodies) not controlled by outside forces | an autonomous judiciary |
| harmonious | 15 | exhibiting equivalence or correspondence among constituents of an entity or between different entities | - |
| phosphorus | 20 | a planet (usually Venus) seen just before sunrise in the eastern sky | - |
| incestuous | 12 | resembling incest as by excessive intimacy | - |
| thunderous | 14 | loud enough to cause (temporary) hearing loss | - |
| monotonous | 12 | tediously repetitious or lacking in variety | nothing is so monotonous as the sea |
| synonymous | 18 | (of words) meaning the same or nearly the same | - |
| eucalyptus | 17 | a tree of the genus Eucalyptus | - |
| ubiquitous | 21 | being present everywhere at once | - |
| chivalrous | 18 | being attentive to women like an ideal knight | - |
| cretaceous | 14 | from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants | - |
| gratuitous | 11 | unnecessary and unwarranted | - |
| lascivious | 15 | driven by lust; preoccupied with or exhibiting lustful desires | - |
| precocious | 16 | appearing or developing early | precocious flowers appear before the leaves as in some species of magnolias |
| impervious | 17 | not admitting of passage or capable of being affected | a material impervious to water |
| fortuitous | 13 | having no cause or apparent cause | fortuitous encounters--strange accidents of fortune |
| adulterous | 11 | characterized by adultery | an adulterous relationship |
| traitorous | 10 | having the character of, or characteristic of, a traitor | a lying traitorous insurrectionist |
| amphibious | 19 | relating to or characteristic of animals of the class Amphibia | - |
| pernicious | 14 | working or spreading in a hidden and usually injurious way | - |
| posthumous | 17 | occurring or coming into existence after a person's death | a posthumous award |
| prodigious | 14 | far beyond what is usual in magnitude or degree | the young Mozart's prodigious talents |
| scrupulous | 14 | characterized by extreme care and great effort | scrupulous attention to details |
| boisterous | 12 | violently agitated and turbulent | boisterous winds and waves |
| villainous | 13 | extremely wicked | a villainous plot |
| contiguous | 13 | having a common boundary or edge; abutting; touching | Utah and the contiguous state of Idaho |
| homunculus | 17 | a person who is very small but who is not otherwise deformed or abnormal | - |
| treasonous | 10 | having the character of, or characteristic of, a traitor | - |
| prospectus | 16 | a catalog listing the courses offered by a college or university | - |
| gluttonous | 11 | given to excess in consumption of especially food or drink | over-fed women and their gluttonous husbands |
| tumultuous | 12 | characterized by unrest or disorder or insubordination | the tumultuous years of his administration |
| fastidious | 14 | having complicated nutritional requirements; especially growing only in special artificial cultures | fastidious microorganisms |
| perfidious | 16 | tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | the perfidious Judas |
| slanderous | 11 | (used of statements) harmful and often untrue; tending to discredit or malign | - |
| obsequious | 21 | attempting to win favor from influential people by flattery | - |
| gregarious | 12 | instinctively or temperamentally seeking and enjoying the company of others | he is a gregarious person who avoids solitude |
| gelatinous | 11 | thick like gelatin | - |
| ungenerous | 11 | lacking in magnanimity | it seems ungenerous to end this review of a splendid work of scholarship on a critical note |
| avaricious | 15 | immoderately desirous of acquiring e.g. wealth | they are avaricious and will do anything for money |
| iniquitous | 19 | characterized by iniquity; wicked because it is believed to be a sin | iniquitous deeds |
| licentious | 12 | lacking moral discipline; especially sexually unrestrained | coarse and licentious men |
| solicitous | 12 | full of anxiety and concern | solicitous parents |
| propitious | 14 | presenting favorable circumstances; likely to result in or show signs of success | propitious omens |
| salubrious | 12 | promoting health; healthful | the salubrious mountain air and water |
| extraneous | 17 | not belonging to that in which it is contained; introduced from an outside source | water free of extraneous matter |
| calamitous | 14 | (of events) having extremely unfortunate or dire consequences; bringing ruin | a calamitous defeat |
| benedictus | 15 | - | - |
| glamourous | 13 | having an air of allure, romance and excitement | - |
| sulphurous | 15 | characterized by oppressive heat and humidity | - |
| curvaceous | 17 | (of a woman's body) having a large bosom and pleasing curves | Hollywood seems full of curvaceous blondes |
| indecorous | 13 | not in keeping with accepted standards of what is right or proper in polite society | indecorous behavior |
| fallacious | 15 | intended to deceive | fallacious testimony |
| herbaceous | 17 | characteristic of a nonwoody herb or plant part | - |
| ungracious | 13 | lacking social graces | - |
| oesophagus | 16 | the passage between the pharynx and the stomach | - |
| homogenous | 16 | all of the same or similar kind or nature | - |
| libidinous | 13 | driven by lust; preoccupied with or exhibiting lustful desires | libidinous orgies |
| trolleybus | 15 | a passenger bus with an electric motor that draws power from overhead wires | - |
| vociferous | 18 | conspicuously and offensively loud; given to vehement outcry | a vociferous mob |
| pugnacious | 15 | ready and able to resort to force or violence | pugnacious spirits...lamented that there was so little prospect of an exhilarating disturbance |
| loquacious | 21 | full of trivial conversation | - |
| euphonious | 15 | having a pleasant sound | a euphonious trill of silver laughter |
| cadaverous | 16 | very thin especially from disease or hunger or cold | - |
| circuitous | 14 | marked by obliqueness or indirection in speech or conduct | the explanation was circuitous and puzzling |
| languorous | 11 | lacking spirit or liveliness | a hot languorous afternoon |
| uproarious | 12 | uncontrollably noisy | - |
| polygamous | 18 | having several forms of gametoecia on the same plant | - |
| scurrilous | 12 | expressing offensive reproach | - |
| retrovirus | 13 | any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
| mendacious | 15 | given to lying | a mendacious child |
| misogynous | 16 | hating women in particular | - |
| factitious | 15 | not produced by natural forces | brokers created a factitious demand for stocks |
| incautious | 12 | carelessly failing to exercise proper caution | an incautious step sent her headlong down the stairs |
| leguminous | 13 | relating to or consisting of legumes | - |
| voluminous | 15 | marked by repeated turns and bends | - |
| portentous | 12 | ominously prophetic | - |
| spirituous | 12 | containing or of the nature of alcohol | spirituous liquors |
| felicitous | 15 | marked by good fortune | a felicitous life |
| diplodocus | 16 | a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
| coniferous | 15 | of or relating to or part of trees or shrubs bearing cones and evergreen leaves | - |
| autologous | 11 | derived from organisms of the selfsame individual | autologous blood donation |
| innumerous | 12 | too numerous to be counted | - |
| inglorious | 11 | (used of conduct or character) deserving or bringing disgrace or shame | inglorious defeat |
| strabismus | 14 | abnormal alignment of one or both eyes | - |
| robustious | 12 | noisy and lacking in restraint or discipline | a robustious group of teenagers |
| nonserious | 10 | - | - |
| gangrenous | 12 | suffering from tissue death | - |
| diaphanous | 16 | so thin as to transmit light | a hat with a diaphanous veil |
| lisianthus | 13 | - | - |
| callibogus | 15 | - | - |
| bunyavirus | 18 | an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
| catawampus | 19 | - | - |
| arenavirus | 13 | animal viruses belonging to the family Arenaviridae | - |
| rancourous | 12 | - | - |
| autonymous | 15 | - | - |
| ahuruhurus | 16 | - | - |
| kekerengus | 19 | - | - |
| indextrous | 18 | - | - |
| larvaceous | 15 | - | - |
| penicillus | 14 | - | - |
| poutassous | 12 | - | - |
| trigeminus | 13 | the main sensory nerve of the face and motor nerve for the muscles of mastication | - |
| sulfureous | 13 | - | - |
| canephorus | 17 | - | - |
| cancellous | 14 | having an open or latticed or porous structure | - |
| calcareous | 14 | composed of or containing or resembling calcium carbonate or calcite or chalk | - |
| byssaceous | 17 | - | - |
| cactaceous | 16 | - | - |
| cacuminous | 16 | - | - |
| calumnious | 14 | (used of statements) harmful and often untrue; tending to discredit or malign | - |
| caliginous | 13 | dark and misty and gloomy | - |
| catarrhous | 15 | - | - |
| chalumeaus | 17 | - | - |
| censorious | 12 | harshly critical or expressing censure | was censorious of petty failings |
| cauliculus | 14 | - | - |
| ceriferous | 15 | - | - |
| ceruminous | 14 | relating to or secreting cerumen | - |
| choriambus | 19 | - | - |
| chylaceous | 20 | consisting of chyle or having the properties of chyle | - |
| chunderous | 16 | - | - |
| coccineous | 16 | - | - |
| clangorous | 13 | having a loud resonant metallic sound | the clangorous locomotive works |
| cistaceous | 14 | - | - |
| colostrous | 12 | - | - |
| commodious | 17 | large and roomy (`convenient' is archaic in this sense) | a commodious harbor |
| coetaneous | 12 | of the same period | - |
| colliculus | 14 | - | - |
| cointreaus | 12 | - | - |
| concinnous | 14 | - | - |
| cornaceous | 14 | - | - |
| coriaceous | 14 | resembling or made to resemble leather; tough but pliable | - |
| conspectus | 16 | an overall summary | - |
| coryphaeus | 20 | - | - |
| curvacious | 17 | - | - |
| cupidinous | 15 | - | - |
| cymiferous | 20 | - | - |
| cynomolgus | 18 | - | - |
| cynopodous | 18 | - | - |
| cryophorus | 20 | - | - |
| deceptious | 15 | - | - |
| decagynous | 17 | - | - |
| decamerous | 15 | - | - |
| decapodous | 16 | - | - |
| decandrous | 14 | - | - |
| deltoideus | 12 | - | - |
| degenerous | 12 | - | - |
| blusterous | 12 | blowing in violent and abrupt bursts | blustering (or blusterous) winds of Patagonia |
| autotomous | 12 | - | - |
| automatous | 12 | - | - |
| autogamous | 13 | characterized by or fit for autogamy | - |
| autogenous | 11 | originating within the body | - |
| autoecious | 12 | of parasites especially rust fungi; completing the entire life cycle on a single host | autoecious rust fungi |
| avenaceous | 15 | - | - |
| auriferous | 13 | containing gold | auriferous quartz veins |
| barretrous | 12 | - | - |
| barratrous | 12 | - | - |
| aposporous | 14 | - | - |
| antonymous | 15 | of words: having opposite meanings | - |
| apocarpous | 16 | (of ovaries of flowering plants) consisting of carpels that are free from one another as in buttercups or roses | - |
| apotropous | 14 | - | - |
| antitragus | 11 | - | - |
| antilogous | 11 | - | - |
| antimonous | 12 | - | - |
| artocarpus | 14 | evergreen Asiatic trees now grown through the tropics: breadfruit; jackfruit | - |
| astragalus | 11 | large genus of annual or perennial herbs or shrubs of north temperate regions; largest genus in the family Leguminosae | - |
| astomatous | 12 | having no mouth or mouthlike opening | - |
| aquiferous | 22 | of or relating to an aquifer | - |
| arenaceous | 12 | resembling or containing or abounding in sand; or growing in sandy areas | arenaceous limestone |
| armigerous | 13 | - | - |
| battailous | 12 | - | - |
| bismuthous | 17 | - | - |
| bituminous | 14 | resembling or containing bitumen | bituminous coal |
| bipetalous | 14 | - | - |
| bigarreaus | 13 | - | - |
| alliaceous | 12 | of or pertaining to the botanical genus Allium | onions, leeks, garlic, chives are alliaceous plants |
| allomerous | 12 | pertaining to allomerism | - |
| allonymous | 15 | - | - |
| allogamous | 13 | relating to cross-fertilization in plants | - |
| amatorious | 12 | - | - |
| allosaurus | 10 | late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | - |
| agapanthus | 16 | any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | - |
| albuminous | 14 | relating to or containing or resembling albumin | - |
| alacritous | 12 | quick and eager | an alacritous response to the invitation |
| anarthrous | 13 | - | - |
| anasarcous | 12 | characterized by or affected by dropsy | - |
| ancipitous | 14 | - | - |
| anatropous | 12 | (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | - |
| anoestrous | 10 | of or relating to anestrus | - |
| anonaceous | 12 | - | - |
| anilinctus | 12 | - | - |
| anadromous | 13 | migrating from the sea to fresh water to spawn | - |
| amylaceous | 17 | resembling starch | - |
| acarpelous | 14 | having no carpels | - |
| acanaceous | 14 | - | - |
| abstemious | 14 | marked by temperance in indulgence | abstemious with the use of adverbs |
| acephalous | 17 | lacking a head or a clearly defined head | acephalous worms |
| aceraceous | 14 | - | - |
| abdominous | 15 | having a large belly | - |
| aeruginous | 11 | - | - |
| acrogenous | 13 | pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem | - |
| acronymous | 17 | characterized by the use of acronyms | - |
| acinaceous | 14 | - | - |
| adenovirus | 14 | any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
| adactylous | 16 | without fingers and/or toes | - |
| hantavirus | 16 | - | - |
| halogenous | 14 | - | - |
| gynandrous | 15 | - | - |
| helianthus | 16 | any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | - |
| hemizygous | 28 | - | - |
| hellacious | 15 | - | - |
| hirudinous | 14 | - | - |
| holodiscus | 16 | - | - |
| hexamerous | 22 | - | - |
| hexandrous | 21 | - | - |
| hexagynous | 24 | - | - |
| humicolous | 17 | - | - |
| homotonous | 15 | - | - |
| homozygous | 28 | having identical alleles at corresponding chromosomal loci | these two fruit flies are homozygous for red eye color |
| homogonous | 16 | - | - |
| homogamous | 18 | - | - |
| homologous | 16 | having the same evolutionary origin but not necessarily the same function | the wing of a bat and the arm of a man are homologous |
| homonymous | 20 | of or related to or being homonyms | - |
| idolatrous | 11 | blindly or excessively devoted or adoring | - |
| immeritous | 14 | - | - |
| hyoscyamus | 23 | genus of poisonous herbs: henbane | - |
| hylotomous | 18 | - | - |
| hypogaeous | 19 | - | - |
| hypogenous | 19 | - | - |
| hypogynous | 22 | - | - |
| impromptus | 18 | - | - |
| impundulus | 15 | - | - |
| implexuous | 21 | - | - |
| impostrous | 14 | - | - |
| insensuous | 10 | - | - |
| insomnious | 12 | - | - |
| isotropous | 12 | invariant with respect to direction | - |
| jaspideous | 20 | - | - |
| jeopardous | 20 | - | - |
| iridaceous | 13 | of or pertaining to or characteristic of plants of the family Iridaceae | - |
| isopterous | 12 | - | - |
| isosporous | 12 | - | - |
| isochroous | 15 | - | - |
| kumarahous | 19 | - | - |
| juncaceous | 21 | - | - |
| keratinous | 14 | - | - |
| lauraceous | 12 | - | - |
| lardaceous | 13 | - | - |
| laniferous | 13 | - | - |
| lanigerous | 11 | - | - |
| lanuginous | 11 | - | - |
| lipomatous | 14 | - | - |
| limivorous | 15 | - | - |
| lentivirus | 13 | - | - |
| limicolous | 14 | - | - |
| liliaceous | 12 | of or pertaining to or characteristic of plants of the family Liliaceae | - |
| glandulous | 12 | - | - |
| glanderous | 12 | - | - |
| glumaceous | 15 | - | - |
| gliomatous | 13 | - | - |
| glomerulus | 13 | a small intertwined group of capillaries in the malpighian body; it filters the blood during urine formation | - |
| gemmaceous | 17 | - | - |
| geophagous | 17 | - | - |
| geophilous | 16 | - | - |
| goloptious | 13 | - | - |
| goluptious | 13 | - | - |
| gonococcus | 17 | the pus-producing bacterium that causes gonorrhea | - |
| gramineous | 13 | - | - |
| tophaceous | 17 | - | - |
| trifarious | 13 | - | - |
| trichinous | 15 | - | - |
| tricrotous | 12 | - | - |
| triticeous | 12 | - | - |
| trochiscus | 17 | - | - |
| trioecious | 12 | - | - |
| tripterous | 12 | - | - |
| triandrous | 11 | - | - |
| tersanctus | 12 | - | - |
| tenebrious | 12 | dark and gloomy | - |
| tendrilous | 11 | - | - |
| tartareous | 10 | - | - |
| telegonous | 11 | - | - |
| tiliaceous | 12 | - | - |
| testaceous | 12 | relating to or possessing a testa or hard shell | testaceous fish |
| theonomous | 15 | - | - |
| uniflorous | 13 | - | - |
| unhumorous | 15 | lacking humor | - |
| undesirous | 11 | having or feeling no desire | a very private man, totally undesirous of public office |
| unperilous | 12 | - | - |
| unpopulous | 14 | - | - |
| uredosorus | 11 | - | - |
| vaginismus | 16 | muscular contraction that causes the vagina to close; usually an anxiety reaction before coitus or pelvic examination | - |
| unvirtuous | 13 | - | - |
| veridicous | 16 | - | - |
| violaceous | 15 | - | - |
| viniferous | 16 | - | - |
| veneficous | 18 | - | - |
| ventricous | 15 | having a swelling on one side | - |
| velutinous | 13 | - | - |
| viticolous | 15 | - | - |
| vitiferous | 16 | - | - |
| viraginous | 14 | - | - |
| voraginous | 14 | - | - |
| viviparous | 18 | producing living young (not eggs) | - |
| typhaceous | 20 | - | - |
| ultravirus | 13 | - | - |
| ultroneous | 10 | - | - |
| umbrageous | 15 | angered at something unjust or wrong | umbrageous at the loss of their territory |
| tuffaceous | 18 | - | - |
| tubicolous | 14 | - | - |
| trousseaus | 10 | - | - |
| xylogenous | 21 | - | - |
| xiphopagus | 25 | - | - |
| xylotomous | 22 | - | - |
| zoophagous | 25 | (of animals) carnivorous | - |
| zoolatrous | 19 | - | - |
| zoophilous | 24 | - | - |
| zoophobous | 26 | - | - |
| zoosporous | 21 | - | - |
| zoochorous | 24 | - | - |
| xenogamous | 20 | - | - |
| xenogenous | 18 | - | - |
| zygocactus | 27 | small genus of Brazilian cacti having flat fleshy usually branched joints and showy red or pink flowers followed by red fleshy fruits | - |
| petroleous | 12 | - | - |
| phototonus | 15 | - | - |
| piliferous | 15 | - | - |
| polyanthus | 18 | florists' primroses; considered a complex hybrid derived from oxlip, cowslip, and common primrose | - |
| poliovirus | 15 | the virus causing poliomyelitis | - |
| polymerous | 17 | - | - |
| polytocous | 17 | - | - |
| polypodous | 18 | - | - |
| polysemous | 17 | of words; having many meanings | - |
| polygenous | 16 | - | - |
| polygynous | 19 | having more than one wife at a time | - |
| plunderous | 13 | - | - |
| poriferous | 15 | full of pores or vessels or holes | - |
| porraceous | 14 | - | - |
| porphyrous | 20 | - | - |
| pomiferous | 17 | - | - |
| pompelmous | 18 | - | - |
| preludious | 13 | - | - |
| predaceous | 15 | hunting and killing other animals for food | - |
| predacious | 15 | hunting and killing other animals for food | - |
| prolixious | 19 | - | - |
| propositus | 14 | the person immediately affected by or concerned with an action | - |
| pronucleus | 14 | the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote | - |
| procoelous | 14 | - | - |
| procacious | 16 | - | - |
| pultaceous | 14 | - | - |
| puberulous | 14 | - | - |
| pupigerous | 15 | - | - |
| pupiparous | 16 | - | - |
| proteinous | 12 | - | - |
| prothallus | 15 | - | - |
| psellismus | 14 | - | - |
| quotatious | 19 | - | - |
| pyrophorus | 20 | tropical click beetles | - |
| qinghaosus | 23 | - | - |
| pyrogenous | 16 | produced under conditions involving intense heat | - |
| recidivous | 16 | - | - |
| ranunculus | 12 | annual, biennial or perennial herbs: buttercup; crowfoot | - |
| rampacious | 16 | - | - |
| rampageous | 15 | displaying raging violence; often destructive | the hot rampageous horses of my will |
| ranivorous | 13 | - | - |
| reptilious | 12 | - | - |
| parvovirus | 18 | any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | - |
| paroecious | 14 | - | - |
| paronymous | 17 | - | - |
| perforatus | 15 | - | - |
| perjurious | 19 | - | - |
| perigynous | 16 | - | - |
| periculous | 14 | - | - |
| pellagrous | 13 | - | - |
| pemphigous | 20 | of or relating to or manifesting pemphigus | - |
| pedipalpus | 17 | - | - |
| pediculous | 15 | - | - |
| penumbrous | 16 | - | - |
| pennaceous | 14 | - | - |
| scarabaeus | 14 | scarabaeid beetle considered divine by ancient Egyptians | - |
| scindapsus | 15 | evergreen climbers with adhesive adventitious roots; southeastern Asia and Brazil | - |
| sarmentous | 12 | - | - |
| saxicavous | 22 | - | - |
| saxicolous | 19 | growing on or living among rocks | - |
| sebiferous | 15 | - | - |
| semichorus | 17 | - | - |
| scrutinous | 12 | - | - |
| scrofulous | 15 | afflicted with scrofula | - |
| sestertius | 10 | - | - |
| setiferous | 13 | - | - |
| setigerous | 11 | - | - |
| serotinous | 10 | - | - |
| sequacious | 21 | - | - |
| sinistrous | 10 | - | - |
| slumberous | 14 | quiet and tranquil | a slumberous June morning |
| soniferous | 13 | - | - |
| spadiceous | 15 | - | - |
| solipedous | 13 | - | - |
| spinaceous | 14 | - | - |
| splendrous | 13 | - | - |
| spondylous | 16 | - | - |
| stertorous | 10 | of breathing having a heavy snoring sound | - |
| stemmatous | 14 | - | - |
| stamineous | 12 | - | - |
| strophulus | 15 | - | - |
| stromatous | 12 | - | - |
| struthious | 13 | - | - |
| stridulous | 11 | - | - |
| subbureaus | 14 | - | - |
| subaqueous | 21 | growing or remaining under water | viewing subaqueous fauna from a glass-bottomed boat |
| stomachous | 17 | - | - |
| streperous | 12 | - | - |
| strepitous | 12 | - | - |
| subfuscous | 17 | - | - |
| subspinous | 14 | - | - |
| subnucleus | 14 | - | - |
| suspirious | 12 | - | - |
| synoecious | 15 | having male and female reproductive organs mixed in the same gametoecium | - |
| synthronus | 16 | - | - |
| syncarpous | 17 | (of ovaries of flowering plants) consisting of united carpels | - |
| symphilous | 20 | - | - |
| synandrous | 14 | - | - |
| synanthous | 16 | - | - |
| symphylous | 23 | - | - |
| roisterous | 10 | - | - |
| rhinovirus | 16 | any of a group of picornaviruses that are responsible for many upper respiratory infections | - |
| rhoicissus | 15 | - | - |
| ruthenious | 13 | - | - |
| saliferous | 13 | containing or yielding salt | saliferous formations |
| rotiferous | 13 | - | - |
| rupicolous | 14 | composed of or inscribed on rock | - |
| roysterous | 13 | - | - |
| rubiaceous | 14 | - | - |
| rubiginous | 13 | - | - |
| membranous | 16 | characterized by formation of a membrane (or something resembling a membrane) | membranous gastritis |
| menstruous | 12 | - | - |
| metacarpus | 16 | the part of the hand between the carpus and phalanges | - |
| mesohippus | 19 | North American three-toed Oligocene animal; probably not directly ancestral to modern horses | - |
| meliaceous | 14 | - | - |
| migrainous | 13 | - | - |
| metoestrus | 12 | - | - |
| metatarsus | 12 | the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds | - |
| metestrous | 12 | - | - |
| miasmatous | 14 | - | - |
| miscanthus | 17 | - | - |
| misandrous | 13 | - | - |
| monoxylous | 22 | - | - |
| monozygous | 25 | - | - |
| monotocous | 14 | - | - |
| monstruous | 12 | - | - |
| monticulus | 14 | - | - |
| monomerous | 14 | - | - |
| mosasaurus | 12 | - | - |
| morigerous | 13 | - | - |
| morbillous | 14 | - | - |
| mordacious | 15 | capable of wounding | - |
| molluscous | 14 | - | - |
| mollitious | 12 | - | - |
| moliminous | 14 | - | - |
| monandrous | 13 | having only one husband at a time | - |
| monanthous | 15 | - | - |
| monoecious | 14 | having male and female reproductive organs in the same plant or animal | - |
| monoculous | 14 | - | - |
| monogenous | 13 | - | - |
| monogynous | 16 | having one head or chief wife at a time (along with concubines) | - |
| monestrous | 12 | having one estrous cycle per year | - |
| monocerous | 14 | - | - |
| mystagogus | 17 | - | - |
| myxomatous | 24 | - | - |
| myophilous | 20 | - | - |
| myrtaceous | 17 | - | - |
| multivious | 15 | - | - |
| mucedinous | 15 | - | - |
| muciferous | 17 | containing or secreting mucus | - |
