Mon`o*ma"ni*a (?), n. [Mono- + mania.]
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.