Hydrocephalus

Hy′dro‐ceph″a‐lus (?), n. [NL., fr. Gr. � hydrocephalus; ὕδωρ water + � head.] (Med.) An accumulation of liquid within the cavity of the cranium, especially within the ventricles of the brain; dropsy of the brain. It is due usually to tubercular meningitis. When it occurs in infancy, it often enlarges the head enormously.