pyrethrum

n. [植]除虫菊, [药]除虫菊杀虫剂

发音

US /paɪˈɹiθɹəm/

词形变化

pyrethrums 复数 pyrethrums

释义与例句

n.
  1. 1.

    Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium.

    可数 不可数
  2. 2.

    Anacyclus pyrethrum (pellitory of Spain)

    可数 不可数
  3. 3.

    Any of several insecticides obtained from these plants; pyrethrin.

    可数 不可数 化学

词汇关系

名词

上位词 4

flower herb insecticide insect powder

词源

From Old English pyretre, from (and later reformed after) Latin pyrethrum (in Pliny), from Hellenistic Ancient Greek πύρεθρον (púrethron).

来源：wiktionary