ˈderə̇s noun
Etymology: New Latin, from Greek, leather covering, skin, from derein to skin — more at tear
1. capitalized : a large genus of tropical Old World shrubs and woody vines (family Leguminosae) including several that are used as sources of native fish poisons and arrow poisons and commercially as sources of rotenone and related insecticidal substances
2. -es : any plant of the genus Derris (especially D. elliptica )
3. -es : a preparation of derris roots and stems that contains rotenone and rotenoids and is especially important as an insecticide