Category:Monomania

Mon`o*ma"ni*a, n. Etym: [Mono- + mania.]

Defn: 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.