hyperencephaly

[hī′pər-ən-sĕfə-lē]

n.

The absence or deficient development of the fetal cranial vault causing the incompletely formed brain to be exposed.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.