Pyrethrum meaning

pī-rē'thrəm, -rĕth'rəm
An insecticide made from the dried flower heads of any of these plants.
noun
0
0
A perennial plant (Chrysanthemum coccineum) of the composite family, widely grown for the white, pink, red, or purple flower heads.
noun
0
0
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.
noun
0
0
Any of several perennial African plants of the genus Tanacetum, especially Tanecetum cinerariifolium.
noun
0
0
(organic chemistry) Any of several insecticides obtained from these plants; pyrethrin.
noun
0
0
Advertisement

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

Pyrethrum Sentence Examples

  • Pyrethrum cinerariaefolium is exported for the manufacture of insect-powder, and sunflowers are cultivated for the oil contained in their seeds.

  • "Alexander's foot," botanical name Anacyclus Pyrethrum, is the pellitory of Spain.

  • PYRETHRUM.

  • The pyrethrum or "feverfew" (nat.

  • The pyrethrum grows best in soil of a loamy texture; this should be well manured and deeply trenched up before planting, and should be mulched in the spring by a surface dressing of half-decayed manure.

More sentences →

Also Mentioned In

Words near pyrethrum in the Dictionary