Pronunciation: (hī"dru-sef'u-lus), [key]
an accumulation of serous fluid within the cranium, esp. in infancy, due to obstruction of the movement of cerebrospinal fluid, often causing great enlargement of the head; water on the brain. Also,hy•dro•ceph•a•lyPronunciation: (hī"dru-sef'u-lē). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.