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locoweed

[loh-koh-weed]
noun
  1. any of various leguminous plants of the genera Astragalus and Oxytropis, of the southwestern U.S. and Mexico, causing locoism in sheep, horses, etc.
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Origin of locoweed

An Americanism dating back to 1875–80; loco + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for locoweed

locoweed

noun
  1. any of several perennial leguminous plants of the genera Oxytropis and Astragalus of W North America that cause loco disease in horses, cattle, and sheep
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012