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 (to͞ob, tyo͞ob)
a. A hollow cylinder, especially one that conveys a fluid or functions as a passage.
b. An organic structure having the shape or function of a tube; a duct: a bronchial tube.
2. A small flexible cylindrical container sealed at one end and having a screw cap at the other, for pigments, toothpaste, or other pastelike substances.
3. Music The cylindrical part of a wind instrument.
4. Electronics
a. An electron tube.
b. A vacuum tube.
5. Botany The lower, cylindrical part of a gamopetalous corolla or a gamosepalous calyx.
a. A tunnel.
b. An underground railroad system, especially the one in London, England.
7. The elongated space inside a wave when it is breaking.
a. An inner tube.
b. 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.
9. Informal
a. Television: What's on the tube?
b. A television set.
10. tubes Informal The fallopian tubes.
v. tubed, tub·ing, tubes
1. To provide with a tube; insert a tube in.
2. To place in or enclose in a tube.
To ride or float on an inflated tube for recreation.
down the tubes/tube Slang
Into a state of failure or ruin: saw her plans go down the tubes.

[French, from Old French, from Latin tubus.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.tubed - of a tiretubed - of a tire; having an inner tube  
tubeless - of a tire; not needing an inner tube