"insanity in regard to a single subect or class of subjects," 1820, probably on model of earlier French monomanie, from Modern Latin monomania, from Greek monos "single, alone" (see mono-) + mania (see mania).
例文
1. "It is the sort of malady which we call monomania ," said the doctor.
「この病気は偏執狂と呼ばれています。」医者は言った。
2.The western world was indeed black with homicidal monomania .