Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Either of two viscous liquid esters, C21H28O3 or C22H28O5, that are extracted from pyrethrum flowers and used as insecticides.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. A resinous compound found in pellitory resin from the root of Anacyclus Pyrethrum.

Etymologies

pyrethr(um) + -in.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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