Dictionary of Human Evolution and Biology

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Fissure

1. narrow groove or cleft separating sections, such as is found on the cerebral cortex. In the cerebrum, a fissure that is especially pronounced and deep is called a sulcus.

2. in archaeology, fine cracks on the inner surface of a flake radiating from the point of percussion; 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"