ARCHAISM
archaism, archaicism
(noun) the use of an archaic expression
Source: WordNet® 3.1
Etymology
Noun
archaism (countable and uncountable, plural archaisms)
The adoption or imitation of archaic words or style.
An archaic word, style, etc.
• L. Douglas
Anagrams
• charisma, machairs
Source: Wiktionary
Ar"cha*ism, n. Etym: [Gr. archaïsme. See Arch, a.]
1. An ancient, antiquated, or old-fashioned, word, expression, or
idiom; a word or form of speech no longer in common use.
2. Antiquity of style or use; obsoleteness.
A select vocabulary corresponding (in point of archaism and
remoteness from ordinary use) to our Scriptural vocabulary. De
Quincey.
Source: Webster’s Unabridged Dictionary 1913 Edition