(ˌhaɪdrəʊˈsɛfələs) or hydrocephaly (ˌhaɪdrəʊˈsɛfəlɪ)
noun
accumulation of cerebrospinal fluid within the ventricles of the brain because its normal outlet has been blocked by congenital malformation or disease. In infancy it usually results in great enlargement of the head
Nontechnical name: water on the brain
Derived forms
hydrocephalic (ˌhaɪdrəʊsɛˈfælɪk), hydrocephaloid (ˌhydroˈcephaloid) or hydrocephalous (ˌhydroˈcephalous)
adjective
hydrocephalus in American English
(ˌhaɪdrəˈsɛfələs)
noun
a condition characterized by an abnormal increase in the amount of fluid in the cranium, esp. in young children, causing enlargement of the head and deterioration of thebrain