01 n. A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock.
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1.
A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock.
Phrases & compounds
Cerebral fissures —
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 —
a spiral needle for catching together the gaping lips of wounds.
Fissure of rolando —
the furrow separating the frontal from the parietal lobe in the cerebrum.
Fissure of Sylvius —
a deep cerebral fissure separating the frontal from the temporal lobe. See Illust. under Brain.
Fissure vein —
a crack in the earth's surface filled with mineral matter.