单词	Unionidae
释义	Unionidae plural noun Uni·​on·​i·​dae : a very large family of freshwater mussels (suborder Submytilacea) having a pearly often roughly sculptured shell with a thick epidermis and larvae that pass through a glochidium stage and being represented in nearly all parts of the world but chiefly in North America where the nacreous shells of many of them are used for button making Word History Etymology New Latin, from Union-, Unio, type genus + -idae
随便看	convincingnesses convive convived convives convivia convivial convivialists convivialities conviviality convivially conviving convivium convo convocate convocation convocational convocationists convocations convoke convoked convokers forbearant forbearer forbearers forbearing

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。