1823, from Mod.L., from Gk. monos "single, alone" + mania. Probably on model of earlier Fr. monomanie. Form of insanity in which the patient is mad on one subject only.
Main Entry: mono·ma·nia Pronunciation: "män-&-'mA-nE-&, -ny& Function: noun : mental disorder especially when limited inexpression to one idea or area of thought