Noun tribulus has 1 sense
  1. Tribulus, genus Tribulus - annual or perennial herbs or subshrubs of warm regions
    --1 is a kind of rosid dicot genus
    --1 is a member of Zygophyllaceae, family Zygophyllaceae, bean-caper family
    --1 has members: caltrop, devil's weed, Tribulus terestris
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