neuronevus
noun
neu·ro·ne·vus
variants:
or chiefly British neuronaevus \ -ˈnē-vəs 
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plural neuronevi
or chiefly British neuronaevi\ -ˌvī
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Medical Definition of neuronevus
: an intradermal nevus that is composed of cells resembling or sometimes held to be derived from neural structures in the skin