Any of various usually woody vines of the genus Derris of tropical Asia, whose roots yield the insecticide rotenone. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "derris" in a sentence
"For example, rotenone, an insecticide derived from a tropical root called derris, is as poisonous to humans as organophosphate chemical pesticides."
"He directed his students to study fish poisons a decade or more before derris root went into mass production in the tropics as a source of rotenone, the most important biodegradable insecticide."
"MessageWorkshop to reviseList of participantsCurrent program thrusts in Upland developmentDegradation of the uplandsNutrient cycles in upland farmsEstablishing an swcsystemFarm management practices that reinforce SWCTraditional soil and water conservation (SWC) technologiesOptions for contour farming: Land management practices for improved water conservationIn-row tillageMaking an A-frameControlling Cogon and TalahibUse of derris as botanical pesticideFire control in the uplandsCultural management of pest infestationOrganic fertilizer sources: BiofertilizersSelection of cover cropsBatao in the upland."