RADIO-OPACITY

\ɹˈe͡ɪdɪˌə͡ʊɒpˈasɪti], \ɹˈe‍ɪdɪˌə‍ʊɒpˈasɪti], \ɹ_ˈeɪ_d_ɪ__ˌəʊ_ɒ_p_ˈa_s_ɪ_t_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd