tube

Sense 1 noun

conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Sense 2 verb

provide with a tube or insert a tube into

Sense 3 noun

electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Sense 4 verb

convey in a tube

inside Paris, they used to tube mail

Sense 5 noun

a hollow cylindrical shape

Sense 6 verb

ride or float on an inflated tube

We tubed down the river on a hot summer day

Sense 7 noun

(anatomy) any hollow cylindrical body structure

Sense 8 verb

place or enclose in a tube

Sense 9 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'