monomania

Part of speech: noun

Insanity as regards one subject.

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Usage examples "monomania":

  1. It's a disease, I tell you- a monomania like any other monomania. - "Out of the Primitive", Robert Ames Bennet.
  2. Indeed, his passion for this sort of literature had become a monomania. - "The Life of Sir Richard Burton", Thomas Wright.
  3. Dave shook his head at the old man's monomania. - "The Sky Is Falling", Lester del Rey.