pyrethrin

(pī ret̸h′rin, -rē′t̸hrin)

noun

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

Origin: < pyrethrum + -in

See pyrethrin in American Heritage Dictionary 4

noun

Either of two viscous liquid esters, C₂₁H₂₈O₃ or C₂₂H₂₈O₅, that are extracted from pyrethrum flowers and used as insecticides.

Origin:

Origin: pyrethr(um)

Origin: + -in

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