ARSENOUS OXIDE

\ˈɑːsənəs ˈɒksa͡ɪd], \ˈɑːsənəs ˈɒksa‍ɪd], \ˈɑː_s_ə_n_ə_s ˈɒ_k_s_aɪ_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd