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	Olaf Olah olallieberry olas Olathe olation Olax Olcha olchas old old Adam old age Old Akkadian Old American Old Armenian old army game Old Assyrian Old Avestan Old Babylonian old before one's time Old Believer old belt Old Bering Sea old blue old boy

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。