1. caltrop, devil's weed, Tribulus terestris, subshrub, suffrutex

usage: tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed

2. water chestnut, water chestnut plant, caltrop, aquatic plant, water plant, hydrophyte, hydrophytic plant

usage: a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits

3. star-thistle, caltrop, Centauria calcitrapa, centaury

usage: Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America

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See also: caltrop (Dictionary)