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Webster 1913 Edition
Pyrethrin
Pyr′eth-rin
,Noun.
[NL.
Pyrethrum
, generic name of feverfew, Gr. [GREEK] feverfew.] (Chem.)
A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; – called also
Pyrethrum camphor
. Definition 2024
pyrethrin
pyrethrin
English
Structure diagram of pyrethrin
Noun
pyrethrin (plural pyrethrins)
- (organic chemistry) Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.