hydrocephalus

英 [,haɪdrə'sef(ə)ləs; -'kef-] 美['haɪdrə'sɛfələs]

1. an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological