1. (noun) tube, tubing
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
2. (noun) 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. (noun) pipe, tube
a hollow cylindrical shape
4. (noun) tube, tube-shaped structure
(anatomy) any hollow cylindrical body structure
5. (verb) 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'"
6. (verb) tube
provide with a tube or insert a tube into
7. (verb) tube
convey in a tube
"inside Paris, they used to tube mail"
8. (verb) tube
ride or float on an inflated tube
"We tubed down the river on a hot summer day"
9. (verb) tube
place or enclose in a tube
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Definition of 'tube' 
