Ver*nac"u*lar, n. The vernacular language; one's mother tongue; often, the common forms of expression in a particular locality.

Ver*nac"u*lar (?), a. [L. vernaculus born in one's house, native, fr. verna a slave born in his master's house, a native, probably akin to Skr. vas to dwell, E. was.] Belonging to the country of one's birth; one's own by birth or nature; native; indigenous; -- now used chiefly of language; as, English is our vernacular language. "A vernacular disease." Harvey.

His skill the vernacular dialect of the Celtic tongue.

Which in our vernacular idiom may be thus interpreted.