Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[pyrethr(um) + –in.]

Examples

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