[toob, tyoob]
a hollow, usually cylindrical body of metal, glass, rubber, or other material, used especially for conveying or containing liquids or gases.
a small, collapsible, cylinder of metal or plastic sealed at one end and having a capped opening at the other from which paint, toothpaste, or some other semifluid substance may be squeezed.
Anatomy, Zoology. any hollow, cylindrical vessel or organ: the bronchial tubes.
any hollow, elongated body or part.
the united lower portion of a gamopetalous corolla or a gamosepalous calyx.
Electronics. electron tube.
the tubular tunnel in which an underground railroad runs.
the railroad itself.
Surfing Slang. the curled hollow formed on the underside of a cresting wave.
British, subway ( def 1 ).
Australian Slang. a can of beer.
Older Slang. a telescope.
verb (used with object), tubed, tubing.
to furnish with a tube or tubes.
to convey or enclose in a tube.
to form into the shape of a tube; make tubular.
down the tube/tubes, Informal. into a ruined, wasted, or abandoned state or condition.

1590–1600; < Latin tubus pipe

tubeless, adjective
tubelike, adjective
multitube, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tube (tjuːb)
1.  a long hollow and typically cylindrical object, used for the passage of fluids or as a container
2.  a collapsible cylindrical container of soft metal or plastic closed with a cap, used to hold viscous liquids or pastes
3.  anatomy
 a.  Eustachian tube short for Fallopian tube
 b.  any hollow cylindrical structure
4.  botany
 a.  the lower part of a gamopetalous corolla or gamosepalous calyx, below the lobes
 b.  any other hollow structure in a plant
5.  (Brit) the tube
 a.  Also called: the underground, US and Canadian equivalent: subway an underground railway system
 b.  the tunnels through which the railway runs
 c.  the train itself
 d.  (capital) trademark the London underground railway system
6.  electronics
 a.  another name for valve
 b.  electron tube cathode-ray tube See television tube
7.  slang the tube a television set
8.  slang (Brit) a stupid or despicable person
9.  slang (Austral) a bottle or can of beer
10.  surfing the cylindrical passage formed when a wave breaks and the crest tips forward
11.  an archaic word for telescope
12.  to fit or supply with a tube or tubes
13.  to carry or convey in a tube
14.  to shape like a tube
[C17: from Latin tubus]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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 tube. Tube top as a women's clothing style is attested from 1972. Tubular is attested from 1673, "having the form of a tube or pipe," but the modern slang sense is from 1982, Valspeak, from surfers' slang for a hollow, curling wave, ideal for riding. 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tube (tōōb, tyōōb)

  1. A hollow cylinder, especially one that conveys a fluid or functions as a passage.

  2. An anatomical structure or organ having the shape or function of a tube; a duct.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

tube definition

1. A CRT terminal. Never used in the mainstream sense of TV; real hackers don't watch TV, except for Loony Toons, Rocky & Bullwinkle, Trek Classic, the Simpsons, and the occasional cheesy old swashbuckler movie.
2. electron tube.
3. (IBM) To send a copy of something to someone else's terminal. "Tube me that note."
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases


see down the tubes.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Ear tube insertion involves placing tubes through the eardrums.
It's easy to blame the tube for fostering a flight from serious issues into
  glitter, froth, and measuring tape.
The tube system was severely disrupted by a strike over staffing cuts.
If more wind shifts tilt this tube so that one end touches the ground, a
  tornado is born.
Idioms & Phrases
Images for tube
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