Tribulus
noun
Trib·u·lus
| \ ˈtribyələs\
Definition of Tribulus
: a genus of chiefly tropical or subtropical herbs (family Zygophyllaceae) introduced into North America with pinnate leaves and yellow or white flowers succeeded by a spiny or prickly fruit of five indehiscent tuberculate carpels — see burnut, caltrop sense 1b, puncture vine
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