Early 16th century; earliest use found in John Fitzherbert (d. 1531). From small + mouthed. With the specific use designating fishes, compare later smallmouth.
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。