Pyrethrum Definition

pī-rēthrəm, -rĕthrəm
noun
A perennial plant (Chrysanthemum coccineum) of the composite family, widely grown for the white, pink, red, or purple flower heads.
Webster's New World
A closely related perennial plant (Tanacetum cinerariifolium), commercially cultivated as the source of an insecticide.
American Heritage
An insecticide made from the dried flower heads of several Old World chrysanthemums, esp. a species (Chrysanthemum cinerariaefolium) now grown extensively in the U.S.
Webster's New World
Synonyms:
  • Chrysanthemum cinerariifolium
  • Dalmatia pyrethrum
  • Tanacetum cinerariifolium
  • Dalmatian pyrethrum
  • Chrysanthemum coccineum
  • Tanacetum coccineum
  • painted daisy
  • genus Pyrethrum

Other Word Forms of Pyrethrum

Noun

Singular:
pyrethrum
Plural:
pyrethrums

Origin of Pyrethrum

  • Latin pellitory (Anacyclus pyrethrum) from Greek purethron from pūr fire (from its warming effect) pyretic

    From American Heritage Dictionary of the English Language, 5th Edition

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