WordNet (r) 3.0 (2006):

hebephrenic 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]