Cōn'/tra-yēr'/vā, n.

n. [Sp. contrayerva, contrayerba, Pg. contraherva, N. Lat. contrayerva, radix contrayervæ, from contra and yerva, yerba, herba, herb, Lat. herba; a counter-herb, an antidote for poison; or, in general, an antidote.] (Bot.) A species of Dorstenia (D. contrayerva), a South American plant, the root of which, being aromatic and astringent, is sometimes used in medicine. — London.