1. [ noun ] (botany) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
Synonyms: water_chestnut_plant water_chestnut
Related terms: aquatic_plant water_caltrop ling Trapa
2. [ noun ] (botany) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed
Synonyms: Tribulus_terestris devil's_weed
Related terms: subshrub Tribulus
3. [ noun ] (botany) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
Synonyms: Centauria_calcitrapa star-thistle
Related terms: centaury
Similar spelling:   Callithrix