n. THe condition of having an unusually large head; it differs from hydrocephalus because there is no increase intracranial pressure and the overgrowth is symmetrical. Syn. -- megacephaly, megalocephaly. [ WordNet 1.5 ]
(n) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical, Syn. megacephaly, megalocephaly