[trawf, trof or, sometimes, trawth, troth]
a long, narrow, open receptacle, usually boxlike in shape, used chiefly to hold water or food for animals.
any of several similarly shaped receptacles used for various commercial or household purposes.
a channel or conduit for conveying water, as a gutter under the eaves of a building for carrying away rain water.
any long depression or hollow, as between two ridges or waves.
Oceanography. a long, wide, and deep depression in the ocean floor having gently sloping sides, wider and shallower than a trench. Compare trench ( def 4 ).
Meteorology. an elongated area of relatively low pressure.
the lowest point, especially in an economic cycle.

before 900; Middle English; Old English trōh; cognate with Dutch, German, Old Norse trog

troughlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trough (trɒf)
1.  a narrow open container, esp one in which food or water for animals is put
2.  a narrow channel, gutter, or gulley
3.  a narrow depression either in the land surface, ocean bed, or between two successive waves
4.  meteorol Compare ridge an elongated area of low pressure, esp an extension of a depression
5.  a single or temporary low point; depression
6.  physics the portion of a wave, such as a light wave, in which the amplitude lies below its average value
7.  economics the lowest point or most depressed stage of the trade cycle
8.  informal (intr) to eat, consume, or take greedily
[Old English trōh; related to Old Saxon, Old Norse trog trough, Dutch trügge ladle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. trog, from P.Gmc. *trugoz (cf. O.Fris., O.S., O.N. trog, M.Du. troch, Du. trog, O.H.G. troc, Ger. trog), perhaps ultimately from PIE *drukos, from base *dru- "wood, tree" (see tree). Originally pronounced in Eng. with a hard -gh- (as in Scottish loch); pronunciation shifted
to -f-, but spelling remained.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
trough   (trôf)  Pronunciation Key 
  1. The part of a wave with the least magnitude; the lowest part of a wave. Compare crest. See more at wave.

  2. A narrow, elongated region of relatively low atmospheric pressure occurring at the ground surface or in the upper atmosphere, and often associated with a front. Compare ridge.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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