Wiktionary
archaicism
n. A usage of an archaic term, phrase, or grammatical arrangement.
WordNet
archaicism
n. the use of an archaic expression [syn: archaism]
Usage examples of "archaicism".
The heroine's small brother, with playful archaicism called "a springald," puts on her skirts and things and passes himself off for his sister or anybody else he pleases.