Etymology
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hydrocephalus (n.)

"accumulation of fluid in the cranial cavity, 'water on the brain,'" 1660s, medical Latin, from Greek hydro- "water" (see water (n.1)) + kephalē "head" (see cephalo-). Also the name of a trilobite genus. Related: Hydrocephalic; hydrocephalous.

updated on November 17, 2018

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Definitions of hydrocephalus from WordNet

hydrocephalus (n.)
an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological;
Synonyms: hydrocephaly
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.