PLUTONIC ROCK

\pluːtˈɒnɪk ɹˈɒk], \pluːtˈɒnɪk ɹˈɒk], \p_l_uː_t_ˈɒ_n_ɪ_k ɹ_ˈɒ_k]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd