Definitions of caltrop:
  • noun:   tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed
  • noun:   Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
  • noun:   a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits

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