ARCHAISM
Meaning of ARCHAISM in English
ar ‧ cha ‧ is ‧ m /ˈɑːkeɪ-ɪz ə m, ɑːˈkeɪ- $ ˈɑːrki-/ BrE AmE noun [countable]
an old word or phrase that is no longer used
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012