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From: Webster's Revised Unabridged Dictionary (1913)

 Trough n.
 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.
 3. Meteor. The transverse section of a cyclonic area where the barometric pressure, neither rising nor falling, has reached its lowest point.
 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.