Main Entry: hy·dro·ceph·a·lus

Pronunciation: \-ˈsef-ə-ləs, British also -ˈkef-\

Function: noun

Inflected Form(s): plural hy·dro·ceph·a·li \-ˌlī\

: an abnormal increase in the amount of cerebrospinal fluid within the cranial cavity that is accompanied by expansion of the cerebral ventricles, enlargement of the skull and especially the forehead, and atrophy of the brain

[hydrocephalus illustration]