Source : Webster's Revised Unabridged Dictionary (1913)

Brachycephaly \Brach`y*ceph"a*ly\, Brachycephalism
\Brach`y*ceph"a*lism\, n. [Cf. F. Brachyc['e]phalie] . (Anat.)
   The state or condition of being brachycephalic; shortness of
   head.