DEMON
  1. Slang. a by-pass circuit in the mind, called demon because it was long so interpreted. Probably an electronic mechanism. (DMSMH Gloss)
  2. a bona-fide demon is one who gives thoughts voice or echoes the spoken word interiorly or who gives all sorts of complicated advice like a real, live voice exteriorly. (DMSMH, p. 88)
  3. Dn use of the word is descriptive slang. (EOS, p. 16)


Technical Dictionary