Noun
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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'"
- subway system -
(anatomy) any hollow cylindrical body structure
- tube shaped structure -
a hollow cylindrical shape
-
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
- vacuum tube - thermionic vacuum tube - thermionic tube - electron tube - thermionic valve -
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
Verb
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place or enclose in a tube
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ride or float on an inflated tube
"We tubed down the river on a hot summer day"
-
convey in a tube
"inside Paris, they used to tube mail"
-
provide with a tube or insert a tube into