2. (Biol.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a
process of self-division, consisting of gradual division or cleavage of the into two parts, each of which
then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ,
undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division,
3. (Zoöl.) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide,
each individual thus forming two or more new ones. See Strobilation.
(Fis`si*pal"mate) a. [L. fissus (p. p. of findere to split) + palma palm.] (Zoöl.) Semipalmate
and loboped, as a grebe's foot. See Illust. under Aves.
(||Fis*sip"a*ra) n. pl. [NL. See Fissiparous.] (Zoöl.) Animals which reproduce by fission.
(Fis*sip"a*rism) n. [See Fissiparous.] (Biol.) Reproduction by spontaneous fission.
(Fis`si*par"i*ty) n. (Biol.) Quality of being fissiparous; fissiparism.
(Fis*sip"a*rous) a. [L. fissus (p. p. of findere to split) + parere to bring forth: cf. F. fissipare.]
(Biol.) Reproducing by spontaneous fission. See Fission. Fis*sip"a*rous*ly, adv.
(Fis`si*pa"tion) n. (Biol.) Reproduction by fission; fissiparism.
(Fis"si*ped Fis*sip"e*dal) , a. [Cf. F. fissipède.] (Zoöl.) Having the toes separated to the base.
(Fis"si*ped), n. (Zoöl.) One of the Fissipedia.
(||Fis`si*pe"di*a) n. pl. [NL., fr. L. fissus (p. p. of findere to cleave) + pes, pedis, a foot.]
(Zoöl.) A division of the Carnivora, including the dogs, cats, and bears, in which the feet are not webbed;
opposed to Pinnipedia.
(Fis`si*ros"tral) a. [Cf. F. fissirostre.] (Zoöl.) Having the bill cleft beyond the horny part, as
in the case of swallows and goatsuckers.
(||Fis`si*ros"tres) n. pl. [NL., fr. L. fissus (p. p. of findere to cleave) + rostrum beak.]
(Zoöl.) A group of birds having the bill deeply cleft.
(Fis"sur*al) a. Pertaining to a fissure or fissures; as, the fissural pattern of a brain.
(Fis`su*ra"tion) n. (Anat.) The act of dividing or opening; the state of being fissured.
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.
(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.
(Fis"sure) v. t. To cleave; to divide; to crack or fracture.
(||Fis`su*rel"la) n. [NL., dim. of L. fissura a fissure.] (Zoöl.) A genus of marine gastropod
mollusks, having a conical or limpetlike shell, with an opening at the apex; called also keyhole limpet.