Source : Webster's Revised Unabridged Dictionary (1913)

Megalocephalia \Meg`a*lo*ce*pha"li*a\, Megalocephaly
\Meg`a*lo*ceph"a*ly\, n. [NL. megalocephalia, fr. Gr. ? having a
   large head.] (Med.)
   The condition of having an abnormally large head. --
   {Meg`a*lo*ce*phal"ic}, a.