Defn: A group of birds having the bill deeply cleft.
FISSURAL
Fis"sur*al, a.
Defn: Pertaining to a fissure or fissures; as, the fissural pattern of a brain.
FISSURATION
Fis`su*ra"tion, n. (Anat.)
Defn: The act of dividing or opening; the state of being fissured.
FISSURE Fis"sure, n. Etym: [L. fissura, fr. findere, fissum, to cleave, split; akin to E. bite: cf. F. fissure.]
Defn: 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.
FISSURE
Fis"sure, v. t.
Defn: To cleave; to divide; to crack or fracture.
FISSURELLA
Fis`su*rel"la, n. Etym: [NL., dim. of L. fissura a fissure.] (Zoöl.)