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A cleaving, splitting, or breaking up into parts.

Act of cleaving or splitting. [R.] Bailey.

The process of generation by development of blastema, or fission of cells, in which the new formation is in all respect like the individual from which it proceeds.

Having no distinct; without sexual action; as, asexual reproduction. See Fission and Gemmation.

s. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. See Bacillus.

r to the plane of the lateral axes. -- Cell cleavage (Biol.), multiplication of cells by fission. See Segmentation. -- Cubuc cleavage, cleavage parallel to the faces of a cube. -- Diagonal cleavage, cleavage parallel to ta diagonal plane. -- Egg clavage. (Biol.) See Segmentation. -- Lateral cleavage, cleavage para…

One of the secondary, and usually sexual, zooids produced by budding or fission from the primary zooids, in animals having alternate generations. In the tapeworms, the joints are deuterozooids.

A process which, among some of the lower forms of life, precedes reproduction by budding, fission, spore formation, etc.

A process of reproduction intermediate between fission and gemmation.

Animals which reproduce by fission.

Reproduction by spontaneous fission.

Reproducing by spontaneous fission. See Fission. -- Fis*sip"a*rous*ly, adv.

Reproduction by fission; fissiparism.

lete segmentation; composed entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to meroblastic.

uct of a single egg, whether it remains a single animal or becomes compound by budding or fission.

Having the form of a little chain; -- applied to bacteria when, as in multiplication by fission, they form chain of filiform individuals.

ial segmentation only; as, meroblastic ova, in which a portion of the yolk only undergoes fission; meroblastic segmentation; -- opposed to holoblastic.

That form of reproduction which requires but one parent, as in reproduction by fission or in the formation of buds, etc., which drop off and form new individuals; asexual reproduction. Haeckel.

Any unicellular plant, or plant forming only a plasmodium, having reproduction only by fission, gemmation, or cell division.

One of the two elongated vibratile young formed by fission of the embryo during the development of certain Gregarinæ.