A condition, either congenital or acquired, in which the head is abnormally large; usually applied to an adult skull with a capacity of over 1450 ml. SYN: leontiasis ossea, macrocephaly, macrocephalia, megacephalia, megalocephaly, megalocephalia, Virchow disease. [mega- + G. kephale, head]
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mega·ceph·a·ly (meg″ə-sefґə-le) macrocephaly.Medical dictionary. 2011.