| 释义 |
〔pyrethrin〕Either of two viscous liquid esters, C21H 28O 3 or C 22H 28O 5, that are extracted from pyrethrum flowers and used as insecticides. 除虫菊酯：两种液体粘性酯中的任一种，C21H 28O 3或C 22H 28O 5，从红花除虫菊花上提取，用于杀死昆虫 〔pyrethrum〕An insecticide made from the dried flower heads ofChrysanthemum cinerariifolium or C. coccineum. 除虫菊杀虫剂：由除虫菊 或 红花除虫菊 的干燥的花朵制成的杀虫药剂 〔pyrethrum〕Any of several Old World plants of the genusChrysanthemum, such as C. coccineum, cultivated for their showy flower heads. 菊花：一种东半球菊科 属植物，例如 红花除虫菊 ，因醒目的花朵而被种植 |