pyrethrin

noun py·re·thrin \pī-ˈrē-thrən, -ˈre-\

Definition of PYRETHRIN

: either of two oily liquid esters C₂₁H₂₈O₃ and C₂₂H₂₈O₅ having insecticidal properties and occurring especially in the flowers of pyrethrum

International Scientific Vocabulary, from Latin pyrethrum

First Known Use: 1882

Medical Dictionary

noun py·re·thrin \pī-ˈrē-thrən, -ˈreth-rən\

: either of two oily liquid esters C₂₁H₂₈O₃ and C₂₂H₂₈O₅ that have insecticidal properties and are the active components of pyrethrum

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