Tube

noun

tub

Noun

an electric railway operating below the surface of the ground (usually in a city)
“in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'”
Similar:MetroSubwayUnderground
Type of:RailroadRailway
a hollow cylindrical shape
Similar:Pipe
Type of:Cylinder
(anatomy) any hollow cylindrical body structure
Type of:Structure
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
Similar:Tubing
Type of:Conduit
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

convey in a tube
“inside Paris, they used to tube mail”
Type of:BringConveyTake
ride or float on an inflated tube
“We tubed down the river on a hot summer day”
Type of:Ride
place or enclose in a tube
Type of:EnfoldEnvelopEnwrap
provide with a tube or insert a tube into
Type of:RenderSupplyFurnish