cerebral cortex ce·reb·ral·cortex uncommon noun 1. the layer of unmyelinated neurons (the gray matter) forming the cortex of the cerebrum Synonymscerebral cortexcerebral mantlepalliumcortex Related words Broader terms neural structure Narrower terms neopalliumarchipallium Parts cerebrum Part of Golgi's cellcortical areafrontal lobeprefrontal lobeparietal lobeoccipital lobetemporal lobegrey matter WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.