SUPERSTRING

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