Meaning of tube

Definition of tube

(noun) conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
a hollow cylindrical shape
(anatomy) any hollow cylindrical body structure
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'"
(verb) 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

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