| trough | 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. Trough gutter, a rectangular or V-shaped gutter, usually hung below the eaves of a house. Trough of the sea, the depression between two waves. Origin: OE. Trough, trogh, AS. Trog, troh; akin to D, G, & Icel. Trog, Sw. Trag, Dan. Trug; probably originally meaning, made of wood, and akin to E. Tree. & 241. See Tree, and cf. Trug. Source: Websters Dictionary (01 Mar 1998) |
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| trough-shell | <zoology> Any bivalve shell of the genus Mactra. See Mactra. Source: Websters Dictionary (01 Mar 1998) |
| Langmuir trough | <apparatus> A device for studying the properties of lipid monolayers at an air/water interface. A moveable barrier connected to a balance allows measurement of surface pressure. (18 Nov 1997) |
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