(psychology) A severe mental disorder, sometimes with physical damage to the brain, marked by a deranged personality and a distorted view of reality.

(medicine) A transient mental health disorder caused by the ingestion of a significant quantity of nutmeg, characterized by such psychotic symptoms as disorientation, hallucinations, and hyperexcitation.

(psychology) A psychological condition specific to some Native American groups, in which a person in fever-induced delusions believes that he or she is possessed by a cannibalistic wendigo spirit, or in which members of the groups hysterically believe a person to be so possessed.

Synonym of Ganser syndrome

(historical) According to 19th-century German psychiatry, a single underlying disease process of which all psychoses were surface variations.

Synonym of Wernicke-Korsakoff syndrome