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