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allethrin

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WordReference Random House Unabridged Dictionary of American English © 2026

al•le•thrin n. [Chem.]

Chemistrya clear, amber, viscous liquid, C₁₉H₂₆O₃, used as an insecticide.

all(yl) + (pyr)ethrin, equivalent. to Pyrethr(um) name of a genus of composite plants + -in² 1945–50

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