Middle English selde, back-formation from seldere (comparative of selden seldom) & seldeste (superlative of selden seldom), from Old English seldor (comparative of seldan seldom) & seldost (superlative of seldan seldom)
英语词典包含469781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。