Definitions of fission

  1. reproduction of some unicellular organisms by division of the cell into two more or less equal parts
  2. a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
  3. A cleaving, splitting, or breaking up into parts.
  4. 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.
  5. A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation.
  6. Division of a cell or its nucleus.
  7. Division by splitting.
  8. The act of cleaving, splitting or breaking up into parts; in physiol. multiplication by means of a process of self- division, consisting of gradual division or cleavage of the body into two parts, each of which then becomes a separate and independent individual, as when a vegetable or animal cell undergoes spontaneous division, the divided parts again subdividing, or an animalcule or polyp divides into two parts.
  9. A splitting or separating.
  10. A cleaving or breaking up into parts; the process by which animal and vegetable cells, and certain simple organisms, spontaneously divide into two independent ones.
  11. A cleaving or splitting into parts.
  12. Cleavage of cells; division of a unicellular organism into two or more parts, thereby reproducing its kind.

Usage examples for fission

  1. This is known as fission or " splitting," and is of interest because this is the way in which the little cells that make up our own bodies increase in number; as, for instance, when a muscle is growing and enlarging under exercise, or when more of the white blood cells are needed to fight some disease. – A Handbook of Health by Woods Hutchinson
  2. We hear these tales of how, in the early days, atomic engines and piles and fission bombs emitted particles which were utterly deadly, which would make anything with which they came in contact deadly, which would bring a horrible death to any human being. – Flight From Tomorrow by Henry Beam Piper
  3. After many million years of molecular agony, when his season of fission had come, he will rend huge fragments from his mass and hurl them helpless into space, there to grow into his satellites. – The Crack of Doom by Robert Cromie
  4. My brother is assistant head chemist, and he's worked up a formula of fission products we got from the Atomic Energy Commission for experimentation. – Breeder Reaction by Winston Marks
  5. It appears that, even in favourable circumstances, for a fresh polyp to be formed by artificial fission it is necessary for the piece to contain cells of both cell- layers. – Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale
  6. Utterly in the dark though we are respecting the causes which set up that process of fission everywhere occurring among the minutest forms of life, we must infer that, when established, it furthered the spread of those which were most favourably differentiated by the medium. – Essays: Scientific, Political, & Speculative, Vol. I by Herbert Spencer
  7. A fission visible as far away as our system must be a terrible thing." – The Gun by Philip K. Dick
  8. Part of his physics training had been concerned with fission and its various applications. – Rip Foster in Ride the Gray Planet by Harold Leland Goodwin
  9. I'll explain the operative details shortly, but if you were there, that could be a little like reviewing the theory underlying nuclear fission for somebody standing at ground zero when the bomb hit. – The Samurai Strategy by Thomas Hoover
  10. They had wasted their resources to the last, fighting bitterly over the ultimate crumbs, with fission bombs, and with muskets, and with swords, and with spears and clubs, and finally they had died out, leaving a planet of almost uniform desert dotted with vast empty cities which even twelve thousand years had hardly begun to obliterate. – Time Crime by H. Beam Piper
  11. Reproduction by fission occurs rarely in the Indian Hydra, but both equal and unequal vertical fission have been observed. – Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale
  12. What I would ask you is, to show me why, since each new invention casts a new light along the pathway of discovery, and each new combination or structure brings into play more conditions than its inventor foresaw, there should not at length be a machine of such high mechanical and chemical powers that it would find and assimilate the material to supply its own waste, and then by a further evolution of internal molecular movements reproduce itself by some process of fission or budding. – Impressions of Theophrastus Such by George Eliot
  13. When it takes place at an early stage in embryonic life, as it does in cases of so- called embryonic fission the product shows, either partly or entirely, phenomena similar to those of embryonic development. – Darwin and Modern Science by A.C. Seward and Others
  14. Many times Copeland went over the same arguments, struggling to speak calmly, and without anger: I wonder if you realize it, Brinker- with enough velocity one large meteor carries more energy than a fission bomb. – Comet's Burial by Raymond Zinke Gallun
  15. Sponges can also be propagated artificially by means of fission and it is probable that this method of reproduction occurs accidentally, if not normally, in natural circumstances. – Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale
  16. Our humans are about to destroy themselves with fission and fusion bombs. – The Galaxy Primes by Edward Elmer Smith
  17. Neither private nor industrial scientists or technicians were allowed to experiment with possibilities of getting power directly from atomic fission – Man of Many Minds by E. Everett Evans
  18. Transverse fission has not been observed. – Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale