lissencephaly
noun
lis·sen·ceph·a·ly
ˌli-sen-ˈse-fə-lē
plural lissencephalies
: the condition of having a smooth appearance on the surface of the brain
specifically
: an abnormality of brain development marked by the presence of a smooth cerebral cortex with few or no convolutions see agyria, pachygyria
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Merriam-Webster unabridged
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