paranoid schizophrenia, a form of schizophrenia characterized by persistent preoccupation with illogical, absurd, and changeable delusions, usually of a persecutory, grandiose, or jealous nature, accompanied by related hallucinations. The symptoms include extreme anxiety, exaggerated suspiciousness, aggressiveness, anger, argumentativeness, and hostility, which may lead to violence. Compare paranoia. Formerly called heboid paranoia. See also schizophrenia.