| English noun: caltrop | 
| 1. | caltrop (plant) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed | 
| 
 | 
 | Synonyms | devil's weed, Tribulus terestris | 
| 
 | 
 | Broader (hypernym) | subshrub, suffrutex | 
| 
 | 
 | Member meronym | genus Tribulus, Tribulus | 
| 
 | 
| 2. | caltrop (plant) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | 
| 
 | 
 | Synonyms | water chestnut, water chestnut plant | 
| 
 | 
 | Broader (hypernym) | aquatic plant, hydrophyte, hydrophytic plant, water plant | 
| 
 | 
 | Narrower (hyponym) | Jesuits' nut, ling, ling ko, Trapa bicornis, Trapa natans, water caltrop | 
| 
 | 
 | Member meronym | genus Trapa, Trapa | 
| 
 | 
| 3. | caltrop (plant) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | 
| 
 | 
 | Synonyms | Centauria calcitrapa, star-thistle | 
| 
 | 
 | Broader (hypernym) | centaury | 
| 
 |