\kˈʌlpabə͡l], \kˈʌlpabə‍l], \k_ˈʌ_l_p_a_b_əl]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald

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Nuclear Fissions

  • Nuclear reaction in which the nucleus of heavy atom such as uranium plutonium is split into two approximately equal parts by a neutron, charged particle, or photon.
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