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Webster's 1913 Dictionary

PYRETHRIN

Pyr "eth *rin, n. Etym: [NL. Pyrethrum, generic name of feverfew, Gr. (Chem. )

Defn: A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.

PYRETHRINE

PYRETHRINE Pyr "eth *rine, n. (Chem. )

Defn: An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum ).

New American Oxford Dictionary

pyrethrin

py re thrin |pīˈrēTHrən, -ˈreTHrən paɪˈriθrən | ▶noun Chemistry any of a group of insecticidal compounds present in pyrethrum flowers. ORIGIN 1920s: from pyrethrum + -in 1 .

Oxford Dictionary

pyrethrin

pyrethrin |pʌɪˈriːθrɪn | ▶noun Chemistry any of a group of insecticidal compounds present in pyrethrum flowers. ORIGIN 1920s: from pyrethrum + -in 1 .