patois
NounWordNet 3.0
Webster's Dictionary (GCIDE)
Patois \Pa`tois"\ (p[.a]`tw[aum]"), n. [F.] A dialect peculiar to the illiterate classes; a provincial form of speech. [1913 Webster]
The jargon and patois of several provinces. --Sir T. Browne. [1913 Webster]