(psychiatry) of or concerning a mental condition resembling paranoia (form of psychosis in which a person imagines that he is being persecuted or that he is very great or important) but also characterized by autistic (concerning a state of mind characterized by daydreaming, hallucinations and disregard of external reality) behavior and gradual deterioration of the personality. —DMSMH Glossary (app. 14.7.90)