USSR

\jˌuːˌɛsˌɛsˈɑː], \jˌuːˌɛsˌɛsˈɑː], \j_ˌuː_ˌɛ_s_ˌɛ_s_ˈɑː]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd