A terpenoid acid obtained from the root of the pellitory, Anacyclus pyrethrum, and related to the pyrethrins.
Mid 19th century; earliest use found in Alfred Garrod (1819–1907), physician.
英汉双解词典包含464360条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。