a hollow, usually cylindrical body of metal, glass, rubber, or other material, used esp. for conveying or containing liquids or gases.

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.

Anatomy, Zoology . any hollow, cylindrical vessel or organ

the bronchial tubes.

Botany .

any hollow, elongated body or part.

the united lower portion of a gamopetalous corolla or a gamosepalous calyx.

inner tube.

Electronics . electron tube.

Informal .

television.

a television set.

mailing tube.

the tubular tunnel in which an underground railroad runs.

the railroad itself.

Surfing Slang . the curled hollow formed on the underside of a cresting wave.

British . subway ( def. 1 ) .

Australian Slang . a can of beer.

Older Slang . a telescope.

to furnish with a tube or tubes.

to convey or enclose in a tube.

to form into the shape of a tube; make tubular. ?

down the tube or tubes, Informal . into a ruined, wasted

or abandoned state or condition.

noun

cannula , chute , conduit , cylinder , duct , hose , pipe , pipeline , pipette , straw , subway , television , tunnel , valinch