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