Definition of tube


  • conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases. Synonyms: tubing.
  • electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope. Synonyms: electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube.
  • a hollow cylindrical shape. Synonyms: pipe.
  • (anatomy) any hollow cylindrical body structure. Synonyms: tube-shaped structure.
  • an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'". Synonyms: metro, subway, subway system, underground.


  • provide with a tube or insert a tube into.
  • convey in a tube; "inside Paris, they used to tube mail".
  • ride or float on an inflated tube; "We tubed down the river on a hot summer day".
  • place or enclose in a tube.

Related words

barrel, blowgun, blowpipe, blowtube, cannula, capillary, catheter, cochlea, coil, column, diode, drain, hose, hosepipe, klystron, magnetron, mouthpiece, pentode, pipage, pipe, piping, salpinx, silencer, siphon, stem, stent, straw, syphon, tetrode, triode, tubule, vas, venturi, vessel, wellpoint.

Words nearby tube

cube, lube, rube, tub, tuba, tubed, tuber, tune.

Rhymes with tube

boob, cube, lube, rube.

Start with tube

tubercles, tuberculins, tubework, tubenoses, tuberose, tuberculoses, tuberculous, tuberculosis, tubeworks, tubed, tuberculate, tubeless, tubeworm, tuberoses, tuberosities, tuberous, tubenose, tuberculated, tubeworms, tubers, tubelike, tuberculoid, tubes, tuberculin, tuberculars, tuber, tubercular, tubercle, tuberosity, tuberoid.

End with tube

phototube, blowtube, flashtube, drawtube, buckytube, nanotube.

More information about tube

tube unscrambled

Scrabble and Words With Friends points

  • tube is a valid Scrabble US word, worth 6 points
  • tube is a valid Scrabble UK word, worth 6 points
  • tube is a valid Words With Friends word, worth 8 points
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