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Medical Dictionary


noun fis·sion \ˈfish-ən also ˈfizh-\

Medical Definition of FISSION

:  a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual
a :  cleavage 2 b :  the splitting of an atomic nucleus resulting in the release of large amounts of energy—called also nuclear fission
fis·sion verb, fis·sioned fis·sion·ing \ˈfish-(ə-)niŋ also ˈfizh-\
fis·sion·al \ˈfish-ən-əl also ˈfizh-\ adjective
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