1.a cylindrical wooden container with slightly bulging sides made of staves hooped together, and with flat, parallel ends.
2.the quantity that such a vessel of some standard size can hold: for most liquids, 311/2 U.S. gallons (119 L); for petroleum, 42 U.S. gallons (159 L); for dry materials, 105 U.S. dry quarts (115 L). Abbreviation: bbl
6.Machinery. the chamber of a pump in
which the piston works.
7.a drum turning on a shaft, as in a weight-driven clock.
8.Horology. the cylindrical case in a watch or clock within which the mainspring is coiled.
9.Ornithology Obsolete. a calamus or quill.
10.the trunk of a quadruped, especially of a horse, cow, etc.
11.Nautical. the main portion of a capstan, about which the rope winds, between the drumhead at the top and the pawl rim at the bottom.
12.a rotating horizontal cylinder in which manufactured objects are coated or polished by tumbling in a suitable substance.
14.Also called throat. Automotive. a passageway in a carburetor that has the shape of a Venturi tube.
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