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单词	protoptile
释义	protoptile noun pro·​top·​tile (ˈ)prō¦täptə̇l plural -s : one of the first set of down feathers in young birds having two sets of down Word History Etymology prot- + -ptile
随便看	nephrotoxicities nephrotoxicity nephthyses nephthytes nephthytis nephthytises nephthytisses nepid Nepidae nepidaes nepionic nepits nepman nepmen Nepos nepotal nepote nepotic nepotism nepotisms nepotist nepotistic nepotists nepouite nepped

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。