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.
© Webster 1913.
Fis"sure (?), v. t.
To cleave; to divide; to crack or fracture.
© Webster 1913.