What is "monomaniacal"

Monomaniac \Mon`oma"ni*ac\, Monomaniacal \Mon`oma"ni*a*cal\, a. Affected with monomania, or partial derangement of intellect; caused by, or resulting from, monomania; as, a monomaniacal delusion.

a. 1 fanatical, or obsessed with one cause or idea to the exclusion of other concerns. 2 Of or relating to a monomaniac.

adj. obsessed with a single subject or idea