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Definition of: hydrocephalus
(hī′drə·sef′ə·ləs) noun Pathol.
An accumulation of watery fluid within the ventricles or between the membranes of the brain. [<HYDRO- + Gk. kephalē head]
—hy′·dro·ceph′a·loid (-loid), hy′dro·ceph′a·lous adjective
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