
In botany, the contrayerva, or contrajerva, is the root and scaly rhizome of various tropical American species of Dorstenia in the family Moraceae (D. contrajerva and D. brasiliensis), a South American plant, the aromatic root of which is sometimes used in medicine as a gentle stimulant and tonic. It was previously used as an antidote to snake bit...
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http://en.wikipedia.org/wiki/Contrayerva

• (n.) A species of Dorstenia (D. Contrayerva), a South American plant, the aromatic root of which is sometimes used in medicine as a gentle stimulant and tonic.
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http://thinkexist.com/dictionary/meaning/contrayerva/
Con`tra·yer'va noun [ Spanish
contrayerba , literally, a counter herb, hence, an antidote for poison, from l.
contra + herba herb.]
(Botany) A species of
Dorstenia (
D. Contrayerva ), a South American plant, the aromatic root of which is sometimes used in medicine as ...
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http://www.encyclo.co.uk/webster/C/150

Contrayerva is the aromatic bitterish root of Dorstenia Contrajerva, a plant of the nettle family, formerly imported from tropical America, and used as a stimulant and tonic.
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http://www.probertencyclopaedia.com/browse/EC.HTM

the root of certain tropical American plants of the genus Dorstenia, of the mulberry family, esp. D. contrajerva, used as a stimulant, diaphoretic, etc.
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https://www.infoplease.com/dictionary/contrayerva
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