A crystalline, non-essential amino acid, CH₃(CH₂)₂CH(NH₂)COOH.
1920s; earliest use found in Journal of the Chemical Society. From German Norvalin from nor- + Valin.
英语词典包含464360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。