pyre thrum

py·re·thrum

[pahy-ree-thruhm, -reth-ruhm]
noun
1.
any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental.
2.
any of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
3.
Pharmacology. the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.

Origin:
1555–65; < Latin: pellitory < Greek pýrethron, akin to pyretós fever; compare pellitory

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World English Dictionary
pyrethrum (paɪˈriːθrəm) [Click for IPA pronunciation guide]
 
n
1.  any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers
2.  any insecticide prepared from the dried flowers of any of these plants, esp C. roseum
 
[C16: via Latin from Greek purethron feverfew, probably from puretos fever; see pyretic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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