/kon'treuh yerr"veuh/ , n.
the root of certain tropical American plants of the genus Dorstenia, of the mulberry family, esp. D. contrajerva, used as a stimulant, diaphoretic, etc.
[ 1650-60; contrayerba, contrahierba contra CONTRA- 1 + herba HERB; so called from its being thought an antidote to poison ]