Dictionary

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

Origin of PYRETHRIN

International Scientific Vocabulary, from Latin pyrethrum
First Known Use: 1882

pyrethrin

noun py·re·thrin \pī-ˈrē-thrən, -ˈreth-rən\   (Medical Dictionary)

Medical Definition of PYRETHRIN

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

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