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 1b, puncture vine

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Origin and Etymology of tribulus

New Latin, from Latin, caltrop, from Greek tribolos, any of various prickly plants, threshing board studded with spikes; akin to Latin tribulum threshing board