monomaniac

Meanings

1. 1
   noun

   a person obsessively preoccupied with one subject, idea, or goal to the exclusion of other concerns

   The detective seemed a monomaniac whenever a difficult case occupied his thoughts.

2. 2
   adj

   obsessively focused on a single subject or purpose

   His monomaniac pursuit of the record damaged every other part of his life.

From monomania + -ac, on the model of maniac. Monomania was coined in French as monomanie from Greek monos, 'single,' + mania, 'madness,' for a supposed mental disorder limited to one subject; monomaniac broadened to any obsessively single-minded person.

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