ar·cha·ism
noun/ˈɑːkeɪɪzəm/
/ˈɑːrkiɪzəm/
[countable, uncountable] (specialist)- a thing that is very old or old-fashioned, especially a word or a style of language or art; the use of such a word or style
古词；古语 Word Originmid 17th cent.: from modern Latin archaismus, from Greek arkhaismos, from arkhaizein ‘imitate archaic styles’, from arkhaios ‘ancient’, from arkhē ‘beginning’.