disorganized type schizophrenia n 1: a form of schizophrenia characterized by severe disintegration of personality including erratic speech and childish mannerisms and bizarre behavior; usually becomes evident during puberty; the most common diagnostic category in mental institutions [syn: {hebephrenia}, {hebephrenic schizophrenia}, {disorganized schizophrenia}, {disorganized type schizophrenia}]