vocabulary of a particular district
• (n.) A dictionary of a peculiar dialect, or of the words and phrases peculiar to one part of a country; a glossary.
Id`i·ot'i·con noun [ New Latin , from Greek ... belonging to a private man, private. See Idiot .] A dictionary of a peculiar dialect, or of the words and phrases peculiar to one part of a country; a glossary. 
idioticon A dictionary of a particular dialect.