- any hollow, elongated body or part.
- the united lower portion of a gamopetalous corolla or a gamosepalous calyx.
verb (used with object), tubed, tub·ing.
Origin of tube
- the lower part of a gamopetalous corolla or gamosepalous calyx, below the lobes
- any other hollow structure in a plant
- Also called: the undergroundan underground railway systemUS and Canadian equivalent: subway
- the tunnels through which the railway runs
- the train itself
- (capital) trademarkthe London underground railway system
Word Origin for tube
1610s, from Middle French tube (mid-15c.), from Latin 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 tube. Tube top as a women's clothing style is attested from 1972. Tube steak is attested from 1963 as "frankfurter," slang meaning "penis" is recorded by mid-1980s. Tubing as a recreational pastime is recorded from 1975.
see down the tubes.