GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Trough , n. [OE. trough, trogh, AS. trog, troh; akin to D., G., & Icel. trog, Sw. tråg, Dan. trug; probably originally meaning, made of wood, and akin to E. tree. √63 & 241. See Tree, and cf. Trug.]
   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
   Any channel, receptacle, or depression, of a long and narrow shape; as, trough between two ridges, etc.
   1913 Webster
   (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