caltrop

Definitions of caltrop
  1. noun
    tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed
    synonyms: Tribulus terestris, devil's weed
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    type of:
    subshrub, suffrutex
    low-growing woody shrub or perennial with woody base
  2. noun
    a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
    synonyms: water chestnut, water chestnut plant
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    types:
    Jesuits' nut, Trapa natans, water caltrop
    a variety of water chestnut
    Trapa bicornis, ling, ling ko
    water chestnut whose spiny fruit has two rather than 4 prongs
    type of:
    aquatic plant, hydrophyte, hydrophytic plant, water 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
  3. noun
    Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
    synonyms: Centauria calcitrapa, star-thistle
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    type of:
    centaury
    any plant of the genus Centaurea
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