Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Plantslocoweedlo‧co‧weed /ˈləʊkəʊwiːd $ ˈloʊkoʊ-/ noun [countable] HBPa plant that grows in America and makes animals ill if they eat itOrigin locoweed (1800-1900) loco + weed ldoceonline.com