SINGULAR FORM

\sˈɪŋɡjʊlə fˈɔːm], \sˈɪŋɡjʊlə fˈɔːm], \s_ˈɪ_ŋ_ɡ_j_ʊ_l_ə f_ˈɔː_m]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd