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\slˈə͡ʊ dˈa͡ʊn], \slˈə‍ʊ dˈa‍ʊn], \s_l_ˈəʊ d_ˈaʊ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd