An insane persou, partlcu-larly one suffering from mania in any of its forms. Said to be inapplicable to idiots (Com. v. Haskell, 2 Brewst. [Pa.] 497); but it is not a technical term either of medlciue or the law, and is incapable of being applied with scientific precision. See Insanity
Source: Black’s Law Dictionary 2nd Ed (1910)
