hyperbrachycephaly

hy·per·brach·y·ceph·a·ly

(hī'pĕr-brak'ē-sef'ă-lē),
An extreme degree of brachycephaly, with a cephalic index of over 85.
[hyper- + G. brachys, short, + kephalē, head]

hyperbrachycephaly

(hī″pĕr-brăk″ē-sĕf′ă-lē) [″ + brachys, short, + kephale, head]
An excessive degree of brachycephaly; having a cephalic index above 85.