Definition of tube in English:


Line breaks: tube
Pronunciation: /tjuːb


  • 1A long, hollow cylinder of metal, plastic, glass, etc. for holding or transporting something, chiefly liquids or gases: a plastic tube is connected to the tap and the beer is ready to be pulled
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    • A straw itself will not hold up well to this experiment, so see if you can get a tube of glass or plastic.
    • The idea is to use the plasma coating to line catheters - plastic tubes surgically inserted into the body so patients can rid themselves of waste products from the blood through a dialysis machine.
    • Catheters - small plastic tubes - are inserted into veins in the arm or leg to access the heart for procedures such as angioplasties and stent placements.
  • 1.1The inner tube of a bicycle tyre.
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    • He had also had many requests for new tyres and tubes and other bicycle parts.
    • The shape can be chubbier - more like a truck tire than a bicycle tube - which lowers the cost for a given plasma volume.
    • They specialize in refurbishing tubular tires with new tubes.
  • 1.2 [mass noun] Material in a tubular form; tubing: the firm manufactures steel tube for a wide variety of applications
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    • By mid-1931, Stanley launched a line of garden tools manufactured with all steel tube handles and stampings.
    • The fuselage was built out of welded chrome-molybdenum steel tube with rod bracing and fabric covering.
    • Two wide wing bracing struts were built from steel tube and balsa wood and fabric covered.
  • 2A thing in the form of or resembling a tube, in particular:
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    • Three works could be manipulated; the massed tubes formed a square or circle mounted on a base that allowed a segment or the whole piece to be rotated by hand.
    • Like threads twisted together to form a rope, the possible flight paths formed tubes in space.
    • Usually, either spheres or tubes form, but not both.
  • 2.1A flexible metal or plastic container sealed at one end and having a screw cap at the other, for holding a semi-liquid substance ready for use: a tube of toothpaste
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    • There is a new tube of toothpaste ready and waiting.
    • He remembers collecting toothpaste tubes, newspapers, pots and pans.
    • In their other hands were new toothbrushes, a tube of toothpaste and container of dental floss they received from their dentists.
  • 2.2A rigid cylindrical container: a tube of Smarties
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    • A home-made lunch is delivered in cylindrical tubes with four compartments each.
    • A shiny black purse, a tube of dark red lipstick, eyeshadow, white chub stick, eyeliner, and a weightless garment, fluttering to the ground.
    • As he walked away, Han took out a lipstick tube from her purse and began applying it to her lips.
  • 2.3Australian informal A can of beer: a tube of lager
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    • Jerry smelled the familiar stench of beer as the tube neared his lips.
    • His Australian colleagues can sit in their armchairs swiggering on a "tube" of Fosters with total immunity smiling that he has taken the rap for the decisions they were responsible in making.
    • Have an ice-cold tube of Fosters on us.
  • 2.4 [usually with adjective or noun modifier] Anatomy , Zoology , & Botany A hollow cylindrical organ or structure in an animal body or in a plant (e.g. a Eustachian tube, a sieve tube).
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    • The bladder and rectum originate from a single hollow tube, the endodermal cloaca.
    • The trachea is unbranched, and is formed by the division of the foregut by a longitudinal septum into two tubes - the trachea and the esophagus.
    • The endothelial tube everywhere remains intact and continuous.
  • 2.5 (tubes) • informal A woman’s fallopian tubes: women with blocked tubes
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    • For example, it is unclear how these superficial peritoneal lesions would give rise to infertility, especially if they were distant from the fimbria of the tubes or ovaries.
    • Mucus hostility means that the secretion from the neck of the womb is abnormal, and kills the sperm so that they cannot travel through the uterus to the tubes.
    • She will have an ultrasound scan of the womb, tubes and ovaries.
  • 2.6A woman’s close-fitting garment, typically without darts or other tailoring and made from a single piece of stretch fabric: [as modifier]: a tube skirt
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    • For a more classic look, there's a square-necked jacket with lateral buttons worn with a tube skirt hemmed at just below the knees.
    • Or it can be a rip off because in the end it is just a piece of long stretch tube.
    • The lightweight tube dress goes straight from the beach to the bar.
  • 2.7(In surfing) the hollow curve under the crest of a breaking wave: he angled his board to get in the tube
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    • At Shipsterns, I think he got the best wave, the biggest tube, although they said mine was bigger.
    • Formal elements include a foreground or apron of foaming wash, and beyond that a wall of wave as it forms a tube, then crests and crashes.
    • Just as with ocean waves, as the wave breaks it forms a tube.
  • 2.8 informal A cigarette: as soon as the no-smoking light dies she reaches for the tubes
  • 3 (the Tube) British trademark The underground railway system in London: a cross-London trek on the Tube
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    • Today's hot topic was the Tube lines of the London Underground.
    • First of all in London we have the Tube which is still owned by the Government, so comparisons can be made there.
    • So we have various views of the world map but drawn as a London Underground Tube map.
  • 3.1A train running on the Tube: I caught the tube home
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    • The use of tube trains has gone down by 40% at the weekends, and between 5 and 15% on week days.
    • However, on the train and tube, I heard lots of northern accents.
    • Instead I will be spending two hours a day on buses, trains and the tube.
  • 4A sealed container, typically of glass and either evacuated or filled with gas, containing two electrodes between which an electric current can be made to flow.
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    • Early diodes in electronics were made from metal plates sealed inside evacuated glass tubes, which could be seen glowing in the innards of old radio sets.
    • Such lamps have two electrodes in a ceramic tube that contains small amounts of mercury and metal-halide salts.
    • Fluorescent lamps generate light by passing electricity through a tube filled with inert gas and a small amount of mercury.
  • 4.1A cathode ray tube, especially in a television set: colour tubes for portables
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    • Simply connect the inverter to an available molex connector, and then connect both cold cathode tubes to the inverter on the opposing side.
    • Look out for early signs of in-car computing, and the erosion of cathode-ray tubes by cheaper liquid-crystal displays.
    • Cathode ray tubes will shrink slightly over that period, from 171 million units to 145 million.
  • 4.2 (the tube) North American informal Television: watching the tube in a country bar
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    • A really bad skiing day is still better than a day spent running or sitting in front of the tube.
    • Sally spent countless hours in front of the tube last season watching the games she was unable to attend in person.
    • The online crowd cut back on television time, watching the tube 4.5 fewer hours per week than the no-Net group did.
  • 4.3North American A thermionic valve.
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    • The conduction of electricity in thin gases in vacuum tubes was the key to the discovery of the electron in 1897.
    • A vacuum tube (also called an electron tube or, in the UK, a valve) is a device sometimes used to amplify electronic signals.
    • This work contains the principles of operation of The Thermionic Vacuum Tube, and coordinates the phenomena encountered in a study of this field.


[with object] Back to top  
  • 1 (usually as adjective tubed) Provide with a tube or tubes: [in combination]: a giant eight-tubed hookah
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    • They are believed to produce sound by moving air through tubed extensions of the larynx to nasal plugs located near the blowholes.
    • That said, the feedback I've heard from our testers indicate seating and inflating our tubeless road tires should be as easier, or even easier in some cases, than a tubed tire.
    • The precipitate was spread homogeneously over the entire surface of the tubed medium using a serologic pipette.
  • 2 informal Fit (a person or animal) with a tube to assist breathing, especially after a laryngotomy.
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    • The charge stemmed from his failure to properly record how he treated Hip Wolf on the day she was allegedly tubed, a practice of pumping medication through a tube inserted into the horse's nostril directly into its stomach.
    • He also did not receive a license in New York, and he received separate fines for tubing a horse and misusing lasix within the last three years of his practice.
  • 3 [with adverbial] Convey in a tube: the wells were flooded, and this water, tubed off, yielded a supply of 38,000 gallons per hour
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    • It has an eight inch bore, and is tubed through ninety feet of earth and ten feet into the rock; the remaining three hundred and fifty feet is without tube, being all in red sandstone.
    • It is tubed through part of the City.
  • 4 (tube it) British informal Travel on the Tube: we tubed it back to Queensway [no object]: I tubed to St Pancras


go down the tube (or tubes)

informal Be completely lost or wasted; fail utterly: the country is going slowly and surely down the tubes
More example sentences
  • Seeing my career go down the tubes always shakes me…
  • They know full well that unless they come up with a constant stream of big sellers their career will go down the tube.
  • Markets are collapsing and manufacturing is going down the tubes, but the people in the malls spend regardless.



More example sentences
  • Two of the most important technological developments were Michelin's creation of the radial tyre in 1948, giving a vastly superior grip, and Dunlop coming up with the tubeless concept in 1972.
  • Esophageal manometry generally is used to accurately place ambulatory pH monitoring probes, although adequate placement recently has been reported with a tubeless system.
  • That said, the feedback I've heard from our testers indicate seating and inflating our tubeless road tires should be as easier, or even easier in some cases, than a tubed tire.


More example sentences
  • Native bluebells are true blue in colour, the blooms are tube-like and elongated, with a delicate droop Spanish bluebells are more upright, the blooms are more of a shorter, open bell-shape.
  • The oesophagus (food pipe) is a tube-like structure, about 25 cm long, lying in the chest.
  • Tearing a piece from a large lump of kneaded dough on the metal table, the master baker swiftly rolled it out into a long, tube-like form.


mid 17th century: from French tube or Latin tubus.

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