"tube" in the noun sense
1. tube, tubing
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
2. tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
3. pipe, tube
a hollow cylindrical shape
4. tube, tube-shaped structure
anatomy) any hollow cylindrical body structure
5. metro, tube, underground, subway system, subway
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'"
"tube" in the verb sense
provide with a tube or insert a tube into
convey in a tube
"inside Paris, they used to tube mail"
ride or float on an inflated tube
"We tubed down the river on a hot summer day"
place or enclose in a tube
Source: WordNet® (An amazing lexical database of English)
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