Definition of

Tube

  1. (noun, artifact) an electric railway operating below the surface of the ground (usually in a city)
  2. (noun, artifact) conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
  3. (noun, artifact) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
  4. (noun, body) (anatomy) any hollow cylindrical body structure
  5. (noun, shape) a hollow cylindrical shape
  6. (verb, contact) place or enclose in a tube
  7. (verb, motion) ride or float on an inflated tube
  8. (verb, motion) convey in a tube
  9. (verb, possession) provide with a tube or insert a tube into

via WordNet, Princeton University

Origin of the word Tube

  1. 1611, from M.Fr. tube (1460), from L. tubus "tube, pipe," of unknown origin. The London subway was christened the Twopenny Tube before it even opened (H.D. Browne, in the "Londoner" of June 30, 1900); tube for "cylindrical railway tunnel" is attested from 1847. The meaning "TV as a medium" is from 1959, short for cathode ray tube or picture… more

via Online Etymology Dictionary, ©2001 Douglas Harper

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