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:
pyrethrinsOrigin of Pyrethrin
pyrethr(um) –in
From American Heritage Dictionary of the English Language, 5th Edition
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