pyrethrin Hear it!

pyrethrin definition

py·reth·rin (pī ret̸h′rin, -rē′t̸hrin)

noun

either of two liquid esters, CHO or CHO, derived from chrysanthemums: the active ingredient of pyrethrum

Etymology: < pyrethrum + -in

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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