(psychiatry) a major mental disorder typically characterized by a separation of the thoughtprocesses and the emotions, a distortion of reality accompanied by delusions and hallucinations, a fragmentation of the personality, motor (involving muscular movement) disturbances, bizarre behavior, etc. The word schizophrenia means "scissors" or "two" plus "head"Na two-head, in other words. —9th ACC Volume 3 Approved Glossary