From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From WordNet (r) 3.0 (2006) [wn]:
trough
n 1: a narrow depression (as in the earth or between ocean waves
or in the ocean bed)
2: a channel along the eaves or on the roof; collects and
carries away rainwater [syn: {gutter}, {trough}]
3: a concave shape with an open top [syn: {bowl}, {trough}]
4: a treasury for government funds [syn: {public treasury},
{trough}, {till}]
5: a long narrow shallow receptacle
6: a container (usually in a barn or stable) from which cattle
or horses feed [syn: {manger}, {trough}]
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