con·​tra·​yer·​va | \ˌkän‧trəˈyərvə, ˌkōn‧-, -yer-\
variants: or contrahierba \-​trəˈyerbə, -​yervə \
plural -s

Definition of contrayerva 

: a tropical American herb (Dorstenia contrayerva) the aromatic root of which was formerly used as a stimulant, tonic, and diaphoretic also : any West Indian species of Aristolochia similarly used

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History and Etymology for contrayerva

Spanish contrayerba, contrahierba, from contra- + yerba, hierba herb, grass, poison, from Latin herba herb; from the belief that it was a poison antidote

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