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1. caltrop  (noun) 
Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America



  More Generic:
    centaury


2. caltrop  (noun) 
a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits



  More Specific:
water caltrop / Jesuits' nut / Trapa natans - a variety of water chestnut
ling / ling ko / Trapa bicornis - water chestnut whose spiny fruit has two rather than 4 prongs


  Member Meronym:
    Trapa     genus Trapa


  More Generic:
    aquatic plant     water plant     hydrophyte     hydrophytic plant


3. caltrop  (noun) 
tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed

  Also known as: devil's weed, Tribulus terestris


  Member Meronym:
    Tribulus     genus Tribulus


  More Generic:
    subshrub     suffrutex


 

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