ACTINIDE

\ˈaktɪnˌa͡ɪd], \ˈaktɪnˌa‍ɪd], \ˈa_k_t_ɪ_n_ˌaɪ_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd