archaism (n.)youdaoicibaDictYouDict[archaism 词源字典]
1640s, "retention of what is old and obsolete," from Modern Latin archaismus, from Greek arkhaismos, from arkhaizein "to copy the ancients" (in language, etc.); see archaic. Meaning "an archaic word or expression" is from c. 1748.[archaism etymology, archaism origin, 英语词源]