RADIOACTIVITY
\ɹˌe͡ɪdɪə͡ʊaktˈɪvɪti], \ɹˌeɪdɪəʊaktˈɪvɪti], \ɹ_ˌeɪ_d_ɪ__əʊ_a_k_t_ˈɪ_v_ɪ_t_i]\
Definitions of RADIOACTIVITY
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By Princeton University
By DataStellar Co., Ltd
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The property of emitting rays or particles of matter, which can pass through various substances opaque to light rays and which produce certain chemical and electrical effects; this property is possessed in an eminent degree by radium and less markedly by uranium, polonium, actinium, and thorium.
By Stedman, Thomas Lathrop
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failure of issue
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