n. 狂热, 偏执狂

[医] 单狂, 偏狂

[ noun ]
a mania restricted to one thing or idea
<noun.motive>

Monomania \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}.