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fission

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fission


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Fission  \Fis"sion\,  n.  [L.  fissio.  See  {Fissure}.] 
  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.  (Zo["o]l.)  A  process  by  which  certain  coral  polyps, 
  echinoderms,  annelids,  etc.,  spontaneously  subdivide,  each 
  individual  thus  forming  two  or  more  new  ones.  See 
  {Strobilation}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  fission 
  n  1:  a  nuclear  reaction  in  which  a  massive  nucleus  splits  into 
  smaller  nuclei  with  the  simultaneous  release  of  energy 
  [syn:  {nuclear  fission}] 
  2:  reproduction  of  some  unicellular  organisms  by  division  of 
  the  cell  into  two  more  or  less  equal  parts 




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