Late 19th century (in an earlier sense). From ancient Greek μονόχρονος momentary, in Hellenistic Greek also in prosody (from μονο- + χρόνος time: see -chronous) + -ous.
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。