caltrop
Nouns
- (n) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed devil's weed, Tribulus terestris,
- (n) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits water chestnut, water chestnut plant,
- (n) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America Centauria calcitrapa, star-thistle,