Pyrethrum meaning
An insecticide made from the dried flower heads of any of these plants.
noun
A perennial plant (Chrysanthemum coccineum) of the composite family, widely grown for the white, pink, red, or purple flower heads.
noun
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
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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