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

单词

Pyrethrums

释义

Pyrethrum /pī-rēˈthrəm, or (esp US) pī-rethˈrəm or (rare) pi-rethˈrəm/

noun

A former genus of composite plants, including feverfew, now considered as belonging to the genus Chrysanthemum
(without cap) a name still applied to various garden flowers, esp varieties of Chrysanthemum coccineum
(without cap) insect-powder made from the flower-heads of various species of pyrethrum
(without cap) in pharmacy, the root of pellitory of Spain (see pellitory²)

ORIGIN: L, from Gr pyrethron pellitory of Spain

pyrēthˈrin (or (esp US) /-rethˈ/) noun

Either of two insecticidal oily esters prepared from pyrethrum flowers

pyrēthˈroid (or (esp US) /-rethˈ/) noun

Any of various synthetic compounds related to the pyrethrins, and sharing their insecticidal properties

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