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From The Collaborative International Dictionary of English v.0.48:
Trough \Trough\ (tr[o^]f), n. [OE. trough, trogh, AS. trog, troh; akin to D., G., & Icel. trog, Sw. tr[*a]g, Dan. trug; probably originally meaning, made of wood, and akin to E. tree. [root]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. [1913 Webster] 2. Any channel, receptacle, or depression, of a long and narrow shape; as, trough between two ridges, etc. [1913 Webster] 3. (Meteor.) The transverse section of a cyclonic area where the barometric pressure, neither rising nor falling, has reached its lowest point. [Webster 1913 Suppl.] Trough gutter (Arch.), a rectangular or V-shaped gutter, usually hung below the eaves of a house. Trough of the sea, the depression between two waves. [1913 Webster]