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Home > Health A â Z > Psychosis. A severe mental disorder in which a person loses the ability to recognize reality or relate to others. Symptoms include being paranoid, having false ideas about what is taking place or who one is, and seeing, hearing, or feeling things that are not there. PubMed Health Glossary.
a mental disorder characterized by symptoms, such as delusions or hallucinations, that indicate impaired contact with reality. 2. any severe form of mental disorder, as schizophrenia or paranoia. Origin of psychosis.