Home › Words › H › hydrencephalocelehydrencephalocelehydrencephalocele means A protrusion of the brain fissure enclosing part of a ventricle.EtymologyFrom hydro- + encephalocele.nounA protrusion of the brain fissure enclosing part of a ventricle.Definitions & examples from Wiktionary (CC BY-SA 3.0).