tube

[toob, tyoob]
noun
1.
a hollow, usually cylindrical body of metal, glass, rubber, or other material, used especially for conveying or containing liquids or gases.
2.
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.
3.
Anatomy, Zoology. any hollow, cylindrical vessel or organ: the bronchial tubes.
4.
Botany.
a.
any hollow, elongated body or part.
b.
the united lower portion of a gamopetalous corolla or a gamosepalous calyx.
6.
Electronics. electron tube.
7.
Informal.
9.
the tubular tunnel in which an underground railroad runs.
10.
the railroad itself.
11.
Surfing Slang. the curled hollow formed on the underside of a cresting wave.
12.
British, subway ( def 1 ).
13.
Australian Slang. a can of beer.
14.
Older Slang. a telescope.
verb (used with object), tubed, tubing.
15.
to furnish with a tube or tubes.
16.
to convey or enclose in a tube.
17.
to form into the shape of a tube; make tubular.
Idioms
18.
down the tube/tubes, Informal. into a ruined, wasted, or abandoned state or condition.

Origin:
1590–1600; < Latin tubus pipe

tubeless, adjective
tubelike, adjective
multitube, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tube (tjuːb)
 
n
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
 
vb
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]
 
'tubeless
 
adj
 
'tube-like
 
adj

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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Etymonline
Word Origin & History

tube
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)
n.

  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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Example sentences for tubes
While it is no longer used for hydraulic tubes, the tunnel still carries water
  mains.
These types of lava tubes tend to be closer to the lava eruption point.
Dripstone is created when lava splashes on the inside walls of the tubes.
The tubes are infilled due to the low slope angle of emplacement.
Synonyms
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