tube (n.)

  1. conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

    [ Syn: tubing ]

  2. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

    [ Syn: vacuum tube , thermionic vacuum tube , thermionic tube , electron tube , thermionic valve ]

  3. a hollow cylindrical shape

    [ Syn: pipe ]

  4. (anatomy) any hollow cylindrical body structure

    [ Syn: tube-shaped structure ]

  5. 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

    [ Syn: metro , underground , subway system , subway ]

    tube (v.)

  1. provide with a tube or insert a tube into

  2. convey in a tube; inside Paris, they used to tube mail'

  3. ride or float on an inflated tube; We tubed down the river on a hot summer day'

  4. place or enclose in a tube

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.