any of several perennial leguminous plants of the genera Oxytropis and Astragalus, found in western parts of North America, containing neurotoxins which cause loco disease in horses, cattle, and sheep
locoweed in American English
(ˈloʊkoʊˌwid)
US
noun
any of several perennial plants (genera Astragalus and Oxytropis) of the pea family, which are common in W North America and cause the loco disease of cattle, sheep, and, esp., horses