Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of several plants of the genera Oxytropis and Astragalus in the pea family, which are widespread in the western and central United States and cause severe poisoning when eaten by livestock. Also called crazyweed, loco1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of several plants indigenous to the western United States, of genus Oxytropis or Astragalus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of several leguminous plants of western North America causing locoism in livestock
  • n. street names for marijuana

Etymologies

Spanish loco, "mad", "insane", and weed. (Wiktionary)

Examples

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