Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun caltrop

3 senses of caltrop

Sense 1
caltrop, devil's weed, Tribulus terestris -- (tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed)
       => subshrub, suffrutex -- (low-growing woody shrub or perennial with woody base)

Sense 2
water chestnut, water chestnut plant, caltrop -- (a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits)
       => aquatic plant, water plant, hydrophyte, hydrophytic plant -- (a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth)

Sense 3
star-thistle, caltrop, Centauria calcitrapa -- (Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America)
       => centaury -- (any plant of the genus Centaurea)