The American Heritage® Dictionary of the English Language, 4th Edition
n. The dorsal region of the cerebral cortex, especially large in higher mammals and the most recently evolved part of the brain. Also called neopallium.
n. The top layer of the cerebral hemispheres in the brain of mammals; part of cerebral cortex.
the GNU version of the Collaborative International Dictionary of English
n. The cortical part of the neencephalon; the most recently evolved part of the cerebral cortex of the brain of higher animals, and the site of most of the higher brain functions; called also neopallium.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the cortical part of the neencephalon
Word Usage
"The neocortex is a thin sheet of cells, folded to form the convolutions that have become a visual synonym for the brain itself."