eighteenthWiktionary 原文/ˌeɪˈtiːnθ/num.第十八，十八分之一中文释义来自 ECDICT构词拆解eighteeneighteen词干th-th后缀-th(no longer productive) forms nouns from verbs of action · (no longer productive except in some informal words) forms nouns of quality from adjectives词源链原始日耳曼语Proto-Germanic约前 500–公元 200 年*ahtudô tehundô↓ 继承古英语Old English约 450–1150 年eahtatēoþa↓ 继承中古英语Middle English约 1150–1500 年eightetenthe↓ 继承词源说明Inherited from Middle English eightetenthe, eightetethe, from Old English eahtatēoþa, from Proto-Germanic *ahtudô tehundô. Equivalent to eighteen + -th (ordinal suffix).释义形容词adjective1The ordinal form of the number eighteen.名词noun1The person or thing in the eighteenth position.2One of eighteen equal parts of a whole.3informalA party to celebrate an eighteenth birthday.同族词派生词 2