The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
brachycephaly n 1: the quality of being brachycephalic [syn: brachycephaly, brachycephalism]