TUBE

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

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