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noun

Fission n.

A cleaving, splitting, or breaking up into parts.

(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.

(Zool.) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation.

(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.

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Etymology of 'Fission'

Collaborative International Dictionary of English 0.48

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"Fission" Quotes from Famous Books

... many people are looking to-day. For this question of areas has its Imperial as well as its local side. You have already seen the Liberal party split upon the Transvaal question; you yourselves have—I am told—experienced some slight parallel tendency to fission, and it is interesting to note that this was, after all, only another aspect of this great question of areas, which I would now discuss in relation to municipal trading. The small communities are fighting for existence and their ...

— Mankind in the Making • H. G. Wells

... eye to his home an' there chained to th' bed leg is Dorsey's dog. Th' name iv th' criminal is P. X. O'Hannigan, an' he lives at twinty-wan hundhred an' ninety-nine South Halsted sthreet, top flat, rear, a plumber be pro-fission. ...

— Observations by Mr. Dooley • Finley Peter Dunne

... antagonistic sects that the application of the principle became impracticable, and for this, as well as for more fundamental reasons, it fell into desuetude. The condition is as difficult today for the process of denominational fission has gone steadily forward, and as this energy of the religious influence weakens the strenuosity of maintenance strengthens. With our 157 varieties of Protestantism confronting Catholicism, Hebraism, and a mass of frank rationalism and infidelity as large in amount ...

— Towards the Great Peace • Ralph Adams Cram

... to the development and construction of a nuclear weapon, scientists and technicians expanded their knowledge of nuclear fission and developed both the gun-type and the implosion mechanisms to release the energy of a nuclear chain reaction. Their knowledge, however, was only theoretical. They could be certain neither of the extent and effects of such ...

— Project Trinity 1945-1946 • Carl Maag and Steve Rohrer

... from higher animals (metazoa) as regards (a) structure, (b) reproduction? Compare the process of fission in an amoeba with the segmentation of the ovum in amphioxus, pointing out the resemblances and differences ...

— Text Book of Biology, Part 1: Vertebrata • H. G. Wells

... facts of reproduction, I would therefore suggest that you should begin with the lowest rung of the ladder, the simplest organisms, such as the amoeba or the volvox. I should show how these multiply by fission, the creature dividing into two, when it is impossible to tell which is the father and which is the mother. I would then pass upwards to more complex organisms, where two individuals are required to form the offspring. ...

— The Power of Womanhood, or Mothers and Sons - A Book For Parents, And Those In Loco Parentis • Ellice Hopkins

Words linked to "Fission" : schizogony, nuclear reaction, fission bomb, nuclear fission, agamogenesis, asexual reproduction