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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.

A person affected by monomania.

Affected with monomania, or partial derangement of intellect; caused by, or resulting from, monomania; as, a monomaniacal delusion.

A form of madness in which the patient conceives himself possessed of devils.

tion. [R.] Shak. To have on the brain, to have constantly in one's thoughts, as a sort of monomania. [Low] Brain box or case, the bony on cartilaginous case inclosing the brain. -- Brain coral, Brain stone coral (Zoöl), a massive reef-building coral having the surface covered by ridges separated by furrows so as to re…

Of or pertaining to delusions; as, delusional monomania.

Extravagant; above real value. This anxiety never degenerated into a monomania, like that which led his [Frederick the Great's] father to pay fancy prices for giants. Macaulay. Fancy ball, a ball in which porsons appear in fanciful dresses in imitation of the costumes of different persons and nations. -- Fancy fair, a…

A monomaniac. [R.]

A kind of monomania in which the passion for music becomes so strong as to derange the intellectual faculties. Dunglison.

A kind of monomania in which the patient believes himself transformed into one of the lower animals.