CALTROP

Definition

1. noun tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets. — synonyms: devil's_weed, Tribulus_terestris
2. noun a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits. — synonyms: water_chestnut, water_chestnut_plant
3. noun Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales. — synonyms: star-thistle, Centauria_calcitrapa