monomania

"There are no limits to the possibilities of monomania," I answered.

Monomania is a derangement of mind in regard to a single subject only.

I understand that this becomes a monomania with a woman who lives in a rented house.

"No, it is possible she was the victim of a sort of monomania," conceded Anstice.

You really have a great deal to answer for, in encouraging this kind of monomania.'

Monomania is mental derangement as to one subject or object.

The monomania of the haunted man gripped him and would not release him.

I should rather say that his intense folly has taken the form of monomania.

I should fall into a monomania, and one of a very loathsome kind.'

But the monomania was on him, and he started for the island in disguise.