Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

FISSURE

Any cleft or groove, usual or otherwise, especially a deep fold in the cerebral cortex which involves the entire thickness of the brain wall. Origin: L. Fissura This entry appears with alow from the Vocabulary of Cell and Molecular Biology

isinglass isis islam island island disease island fever island flap island of Reil (3)