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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 enfolding of the whole wall of the cerebrum.


 - Fissure needle (Surg.), a spiral needle for catching together the gaping lips of wounds.


 - 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.


 - Fissure vein (Mining), a crack in the earth's surface filled with mineral matter.


 - vb. To cleave; to divide; to crack or fracture.

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