FISSURE

fissure. Fissure, n. a cleft, a shasm; v.t. to cleave, to gape

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Fis″sure (?), n. [[L. fissura, fr. findere, fissum, to cleave, split; akin to E. bite: cf. F. fissure.]] 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.