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[hahy-druh-sef-uh-luh s] /ˌhaɪ drəˈsɛf ə ləs/
noun, Pathology
an accumulation of serous fluid within the cranium, especially in infancy, due to obstruction of the movement of cerebrospinal fluid, often causing great enlargement of the head; water on the brain.
Also, hydrocephaly
[hahy-druh-sef-uh-lee] /ˌhaɪ drəˈsɛf ə li/ (Show IPA)
Origin of hydrocephalus
1660-70; < Late Latin hydrocephalus (morbus) water-headed (sickness), translation of Greek tò hydroképhalon (páthos). See hydro-1, -cephalous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for hydrocephalus'


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, hydrocephalous, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for hydrocephalus'



1660s, medical Latin, from Greek hydro- "water" (see water (n.1)) + kephale "head" (see cephalo-). Related: Hydrocephalic; hydrocephalous.

Online Etymology Dictionary, © 2010 Douglas Harper
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hydrocephalus' in Medicine

hydrocephalus hy·dro·ceph·a·lus (hī'drō-sěf'ə-ləs) or hy·dro·ceph·a·ly (-lē)
A usually congenital condition in which an abnormal accumulation of fluid in the cerebral ventricles causes enlargement of the skull and compression of the brain, destroying much of the neural tissue.

hy'dro·ce·phal'ic (-sə-fāl'ĭk) or hy'dro·ceph'a·loid' adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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