Webster's English Dictionary

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trough

trough \'tro.f, by bakers often 'tro-\ \'tro.fs, 'tro.vz, 'tro-z\ n or 
   troughs [ME, fr. OE trog; akin to OE tre-ow tree, wood - more at TR] pl EE 
   1a: a long shallow often V-shaped receptacle for the drinking water or feed 
    of domestic animals 1b: any of various domestic or industrial containers  
   2a: a conduit, drain, or channel for water; esp : a gutter along th e eaves 
   2b: a long and narrow or shallow channel or depression (as between waves or 
    hills) 3: the minimum point of a complete cycle of a periodic function : 
   as  3a: an elongated area of low barometric pressure  3b: the low point in 
   a business cycle