American English Dictionary
Definition of “pyrethrum”
Word Frequency
pyrethrum (paɪˈrɛθrəm
; paɪˈriθrəm
)
Definitions
noun
- a perennial plant (Chrysanthemum coccineum) of the composite family, widely grown for the white, pink, red, or purple flower heads
- 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.
Word Origin
ModL < L < Gr pyrethron, feverfew < pyr, fireSponsored Links
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