/ Dictionary / Index H hydrocephalus: Meaning and Definition of Find definitions for: hy•dro•ceph•a•lus Pronunciation: (hī"dru-sef'u-lus), [key] — n. Pathol. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrocephalus (Thesaurus) hydrocephaloid hydrochloric Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language