Mid 17th century. In sense 1, occurring as a graphic abbreviation for post-classical Latin aqua aqua in various post-classical Latin and borrowed phrases, as aqua regia, etc.
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。