archaic/ɑ:ˈkeɪɪk; ɑr`keɪk/ adj1 of a much earlier or an ancient period in history 古代的.2 (esp of words, etc in a language) no longer in current use （尤指词语）已不通用的, 古体的, 陈旧的 `Thou art' is an archaic form of `you are'. `Thou art'是`you are'的古体.
牛津英汉双解词典