Flatness of the skull in which the vertical cranial index is below 70.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for platycephaly
Historical Examples of platycephaly
In the living species, the skull is generalized, rather than specialized toward either extreme dolichocephaly or platycephaly.