mac·ro·ceph·a·ly 
(măk′rō-sĕfə-lē) also mac·ro·ce·pha·li·a (-sə-fālē-ə, -fālyə)
(măk′rō-sĕfə-lē) also mac·ro·ce·pha·li·a (-sə-fālē-ə, -fālyə)n.
Abnormal largeness of the head. Also called megacephaly, megalocephaly.
mac′ro·ce·phalic (-sə-fălĭk), mac′ro·cepha·lous adj.