Idioticon

from The Collaborative International Dictionary of English v.0.48

Idioticon \Id`i*ot"i*con\, n. [NL., fr. Gr. ? 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.
   [1913 Webster]