Archaism :: Archaism (a.) An ancient, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use..
Archaism :: Archaism (a.) Antiquity of style or use; obsoleteness.
Archaistic :: Archaistic (a.) Like, or imitative of, anything archaic; pertaining to an archaism..