Sodium.
Mid 19th century; earliest use found in Andrew Ure (1778–1857), chemist. From scientific Latin natrium from natr- (in French natron) + -ium.
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。