from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hollow cylinder, especially one that conveys a fluid or functions as a passage.
  • n. An organic structure having the shape or function of a tube; a duct: a bronchial tube.
  • n. A small flexible cylindrical container sealed at one end and having a screw cap at the other, for pigments, toothpaste, or other pastelike substances.
  • n. Music The cylindrical part of a wind instrument.
  • n. Electronics An electron tube.
  • n. Electronics A vacuum tube.
  • n. Botany The lower, cylindrical part of a gamopetalous corolla or a gamosepalous calyx.
  • n. Chiefly British An underground railroad tunnel.
  • n. Chiefly British An underground railroad system, especially the one in London, England.
  • n. A tunnel.
  • n. An inner tube.
  • n. An inflatable tube or cushion made of rubber or plastic and used for recreational riding, as behind a motor boat or down a snow-covered slope.
  • n. Informal Television: What's on the tube?
  • n. Informal A television set.
  • n. Informal The fallopian tubes.
  • transitive v. To provide with a tube; insert a tube in.
  • transitive v. To place in or enclose in a tube.
  • intransitive v. To ride or float on an inflated tube for recreation.
  • idiom tubes Slang Into a state of failure or ruin: saw her plans go down the tubes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Anything that is hollow and cylindrical in shape.
  • n. An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semi-liquid substances.
  • n. The London Underground railway system, originally referred to the lower level lines that ran in tubular tunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)
  • n. A tin can containing beer (or other beverage?).
  • n. A wave which pitches forward when breaking, creating a hollow space inside.
  • n. A television. Also, derisively, boob tube. British: telly
  • v. To make or use tubes

from the GNU version of the Collaborative International Dictionary of English

  • n. A hollow cylinder, of any material, used for the conveyance of fluids, and for various other purposes; a pipe.
  • n. A telescope.
  • n. A vessel in animal bodies or plants, which conveys a fluid or other substance.
  • n. The narrow, hollow part of a gamopetalous corolla.
  • n. A priming tube, or friction primer. See under Priming, and Friction.
  • n. A small pipe forming part of the boiler, containing water and surrounded by flame or hot gases, or else surrounded by water and forming a flue for the gases to pass through.
  • n.
  • n. A more or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm.
  • n. One of the siphons of a bivalve mollusk.
  • n. A tunnel for a tube railway; also (Colloq.), a tube railway; a subway.
  • transitive v. To furnish with a tube.

from The Century Dictionary and Cyclopedia

  • A pipe or hollow cylinder, especially when of small size and used as a conduit for liquids, or for containing liquids, as in some forms of scientific apparatus.
  • Specifically, the main body of a musical instrument of either the wood wind or the brass wind group. The bore of such instruments is usually conical, but sometimes cylindrical.
  • In anatomy and zoology, a hollow tubular organ; a pipe, canal, or duct conveying fluid or gas; especially, a pipe which seems to be empty—that is, conveys air: as, the bronchial tubes; the Eustachian tube.
  • In botany, any hollow elongated body or part of an organ: applied especially to a gamopet-alous corolla or gamosepalous calyx, also to a united circle of stamens (see cut 9 under stamen).
  • A priming-tube.
  • A telescope, or that part of it into which the lenses are fitted.
  • The barrel of a chain-pump.
  • A small receptacle of drawn lead, of approximately tubular form, closed at the bottom by bending it over twice or three times on itself, and having a screw-cap at the top, used to hold pigments or similar matter in a semifluid condition.
  • To furnish with a tube or tubes.
  • To receive or inclose in a tube.
  • n. A city subway in the form of a tunnel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. provide with a tube or insert a tube into
  • n. (anatomy) any hollow cylindrical body structure
  • v. ride or float on an inflated tube
  • v. convey in a tube
  • n. conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
  • n. a hollow cylindrical shape
  • n. an electric railway operating below the surface of the ground (usually in a city)
  • v. place or enclose in a tube
  • n. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope


from The American Heritage® Dictionary of the English Language, 4th Edition

French, from Old French, from Latin tubus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle French tube, from Latin tubus ("tube, pipe").


  • When an ovum is matured, it escapes from the ovary into the narrow tube referred to, called the _Fallopian tube_, and passes down into the cavity of the uterus.

    Plain Facts for Old and Young

  • It is passed down a tube that we call the _food tube_.

    The Child's Day

  • The _middle ear_, it will be seen, is a drum with its stretched membrane like any other drum, and it too has a communication with the exterior air through a tube, the _Eustachian tube_, which leads from the drum into the back part of the throat.

    Voice Production in Singing and Speaking Based on Scientific Principles (Fourth Edition, Revised and Enlarged)

  • Diagnosis may also include: chest X-ray electrocardiogram (ECG) – a record of the electrical activity of the heart cardiac catheterization – a thin tube is inserted into the heart through a vein and/or artery in either the leg, the neck, or through the umbilicus (“belly button” - used in newborns only). cardiac MRI

    Mitral Stenosis, Mitral Regurgitation and Mitral Valve Prolapse

  • The tube is a catheter (a thin tube) placed into the cecum, the first part of the large bowel (in the lower right abdomen).

    Percutaneous Cecostomy Tube Placement

  • Cardiac magnetic resonance imaging (MRI) – detailed images of the heart produced by magnets cardiac catheterization – a thin tube is inserted into the heart through a large vein and/or artery in either the side of the neck, or groin


  • More rarely, cardiaccatheterization will be required: a thin tube is inserted into the heart through a vein and/or artery in either the leg or through the umbilicus (“belly button”).

    Ebstein’s Anomaly of the Tricuspid Valve

  • This test usually confirms the diagnosis. cardiac catheterization – a thin tube is inserted into the heart through a vein and/or artery in either the leg or through the umbilicus (“belly button”)

    Tricuspid Atresia

  • The doctors were also asked whether other issues had led them to recommend the heart test — called a cardiac catheterization — during which a thin tube is threaded to the heart to check how well it is working and to look for disease.

    1 in Four Doctors Order Medical Tests Out of Fear of Getting Sued | Impact Lab

  • Dar – For a tin tube is inserted for the passage of urine.

    The Book of The Thousand Nights And A Night


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  • In the website "Riptionary. Surf Lingo Lexicon": "The cylindrical vortex or cone shaped hole created when a wave lip pitches out far and clean enough to create a space between the wave and the lip.". Link:

    November 21, 2010

  • An endotracheal tube, a breathing tube placed down someone's throat into their windpipe.

    Also, to put one in a patient. "He couldn't keep up his sats, so we had to tube him."

    January 26, 2008