the root of certain tropical American plants of the genus Dorstenia, of the mulberry family, esp. D. contrajerva, used as a stimulant, diaphoretic, etc.
Origin: 1650–60; < Sp contrayerba, contrahierba < L contrācontra-1 + herbaherb; so called from its being thought an antidote to poison
[kon-truh-yur-vuh] 
