Pyrethrin Definition

pī-rēthrĭn, -rĕthrĭn
noun
Either of two liquid esters, C21H28O3 or C22H28O5, derived from chrysanthemums: the active ingredient of pyrethrum.
Webster's New World

(organic chemistry) Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.

Wiktionary

Other Word Forms of Pyrethrin

Noun

Singular:
pyrethrin
Plural:
pyrethrins

Origin of Pyrethrin

  • pyrethr(um) –in

    From American Heritage Dictionary of the English Language, 5th Edition

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pyrethrin