the root of certain tropical American plants of the genus Dorstenia, of the mulberry family, especially D. contrajerva, used as a stimulant, diaphoretic, etc.
Origin: 1650–60; < Spanish contrayerba, contrahierba < Latin contrācontra-1 + herbaherb; so called from its being thought an antidote to poison
the root of any of several tropical American moraceous plants of the genus Dorstenia, esp D. contrayerva, used as a stimulant and tonic
[C17: from Spanish contrayerba, from contra- + yerba grass, (poisonous) plant, from Latin herba; referring to the belief that it was an antidote to poisons]