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fission

noun
🔊/ˈfɪʃn/
🔊/ˈfɪʃn/
 [uncountable]
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  1. (also nuclear fission)
     (physics物理) the act or process of splitting the nucleus (= central part) of an atom, when a large amount of energy is released （核）裂变，分裂compare fusion
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    Topics Physics and chemistryc2
  2. (biology生物) the division of cells as a method of producing new cells裂体生殖Topics Biologyc2
    3. Word Originearly 17th cent.: from Latin fissio(n-), from findere ‘to split’.