'megacephaly' definitions:

Definition of 'megacephaly'

(from WordNet)
noun
An abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical [syn: macrocephaly, megacephaly, megalocephaly]

Definition of 'megacephaly'

From: GCIDE
  • 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; called also megacephaly. -- {Meg`a*lo*ce*phal"ic}, a. [Webster 1913 Suppl.]