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exencephaly

(ĕk′sən-sĕf′ə-lē)
n.
  1. A condition in which the skull is defective, causing exposure or extrusion of the brain.
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Related formsex′en•ce•phal′ic (-sə-făl′ĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.