Dictionary of Human Evolution and Biology

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1. outer layer of an organ or structure; cortical.

2. in the cerebrum of the human brain, the highly convoluted expansion of the neopallium, the gray matter that contains centers of consciousness and rational thought.

3. the outer rind of a cobble or core possessing the ancient patina or weathering surface; one of the diagnostic features that archaeologists use to distinguish a stone tool from a naturally occurring geofact.

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From "Dictionary of Nursing and Individual Health Care"