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From: Webster's Revised Unabridged Dictionary (1913)

 Fis·sure n.  A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock.
 Cerebral fissures Anat., the furrows or clefts by which the surface of the cerebrum is divided; esp., the furrows first formed by the infolding of the whole wall of the cerebrum.
 Fissure needle Surg., a spiral needle for catching together the gaping lips of wounds. --Knight.
 Fissure of rolando Anat., the furrow separating the frontal from the parietal lobe in the cerebrum.
 Fissure of Sylvius Anat., a deep cerebral fissure separating the frontal from the temporal lobe. See Illust. under Brain.
 Fissure vein Mining, a crack in the earth's surface filled with mineral matter. --Raymond.