macrocephaly n 1: an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical [syn: {macrocephaly}, {megacephaly}, {megalocephaly}]
macrocephaly \macrocephaly\ 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]