A type of anencephaly in which the brain and cranium are present in rudimentary form. [mero- + G. an- priv. + enkephalos, brain]
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mero·an·en·ceph·a·ly (mer″o-an″ən-sefґə-le) [mero-1 + anencephaly] congenital absence of part of the brain, usually the forebrain and midbrain. Cf. anencephaly.Medical dictionary. 2011.