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Noun chain reaction has 2 senses
  1. chain reaction - a series of chemical reactions in which the product of one is a reactant in the next
    --1 is a kind of     chemical reaction, reaction
  2. chain reaction - a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
    --2 is a kind of     nuclear reaction
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