COBALT 60

\kˈə͡ʊbɒlt sˈɪksti], \kˈə‍ʊbɒlt sˈɪksti], \k_ˈəʊ_b_ɒ_l_t s_ˈɪ_k_s_t_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd