英语词汇“pyrethrum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

py·re·thrum

(pī-rēthrəm, -rĕthrəm)

a. A Eurasian perennial plant (Tanacetum coccineum) in the composite family, cultivated for its colorful flower heads and formerly used as a source of an insecticide. Also called painted daisy.

b. A closely related perennial plant (Tanacetum cinerariifolium), commercially cultivated as the source of an insecticide.

2. An insecticide made from the dried flower heads of any of these plants.

[Latin, pellitory (Anacyclus pyrethrum), from Greek purethron, from pūr, fire (from its warming effect); see PYRETIC.]

单词	pyrethrum
释义	py·re·thrum (pī-rēthrəm, -rĕthrəm) n. 1. a. A Eurasian perennial plant (Tanacetum coccineum) in the composite family, cultivated for its colorful flower heads and formerly used as a source of an insecticide. Also called painted daisy. b. A closely related perennial plant (Tanacetum cinerariifolium), commercially cultivated as the source of an insecticide. 2. An insecticide made from the dried flower heads of any of these plants. [Latin, pellitory (Anacyclus pyrethrum), from Greek purethron, from pūr, fire (from its warming effect); see PYRETIC.]
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