Late 19th century. From post-classical Latin achromos or its etymon ancient Greek ἄχρωμος colourless + -ous. Compare earlier achromatous, and also achromatistous and achroous.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。