Trough(trf), n. [OE. trough, trogh, AS. trog, troh; akin to D., G., & Icel. trog, Sw. trg, Dan. trug; probably originally meaning, made of wood, and akin to E. tree. 63 & 241. See Tree, and cf. Trug.] 1. A long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a long tray; also, a wooden channel for conveying water, as to a mill wheel.
2. Any channel, receptacle, or depression, of a long and narrow shape; as,
trough between two ridges, etc.
(Meteor.) The transverse section of a cyclonic area where the barometric pressure, neither rising nor falling, has reached its lowest point.
[Webster 1913 Suppl.]
(Arch.), a rectangular or V-shaped gutter, usually hung below the eaves of a house. --
Trough of the sea, the depression between two waves.
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