cranioschisis
(krā′nē-ŏs′kĭ-sĭs)- Congenital failure of the skull to close, usually accompanied by defective development of the brain.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.