monomania Meaning, Definition & Usage

  1. noun a mania restricted to one thing or idea
    possession.

WordNet

Mon`o*ma"ni*a noun
Etymology
Mono- + mania.
Definitions
  1. Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement. Syn. -- Insanity; madness; alienation; aberration; derangement; mania. See Insanity.

Webster 1913