\hˈʌlsi͡ən], \hˈʌlsi‍ən], \h_ˈʌ_l_s_iə_n]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

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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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