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Fission   /fˈɪʃən/   Listen
noun
Fission  n.  
1.
A cleaving, splitting, or breaking up into parts.
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, under Division.
3.
(Zool.) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation.
4.
(Physics) The act or process of disintegration of an atomic nucleus into two or more smaller pieces; called also nuclear fission. The process may be spontaneous or induced by capture of neutrons or other smaller nuclei, and usually proceeds with evolution of energy.





Collaborative International Dictionary of English 0.48


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"Fission" Quotes from Famous Books



... systems Dr. See ascribes to the effect of "tidal friction," the double stars having had their birth through fission of original fluid masses (just as the moon, according to George Darwin's theory, was born from the earth), and the reaction of tidal friction having not only driven them gradually farther apart but rendered their ...
— Pleasures of the telescope • Garrett Serviss
... consciousness attracted by sensations in the genital organs. This appears rather remarkable, inasmuch as we must assume that in the phylogeny of our species the processes of detumescence appeared earlier. Originally, in the earlier ancestral types, reproduction was effected by fission or gemmation (simple division or budding), without any necessity for conjugation with another individual of the species; and reproduction by gemmation corresponds to the processes of detumescence, to the ejaculation of the spermatozoa ...
— The Sexual Life of the Child • Albert Moll


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