noun Medicine/Medical.
congenital absence of part or all of the brain.
Also, anencephalia [an-en-suh-feyl-yuh, an-en-] .

1825–35; < Neo-Latin; see an-1, encephal-, -y3

anencephalic [an-en-suh-fal-ik, an-en-] , anencephalous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anencephalic (ˌænɛnsəˈfælɪk)
born with no or only a partial brain
[an- + encephalic]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

anencephaly an·en·ceph·a·ly (ān'ən-sěf'ə-lē)
Congenital absence of most of the brain and spinal cord.

an'en·ce·phal'ic (-sə-fāl'ĭk) or an'en·ceph'a·lous (-sěf'ə-ləs) adj.

anencephaly an·en·ceph·a·ly (an'en-sef'ā- lē)
markedly defective development of the brain, together with absence of the bones of the cranial vault and the cerebral and cerebellar hemispheres, and with only a rudimentary brain stem and some traces of basal ganglia present

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But in the endless coma of anencephaly or a persistent vegetative state, there is nothing.
Babies with anencephaly usually die within days from birth.
Anencephaly is a neural tube defect in which the top part of the skull and brain fail to form properly.
Anencephaly is a birth defect that affects the closing of the neural tube during pregnancy.
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