DOCTOR'S DEGREE

\dˈɒktəz dɪɡɹˈiː], \dˈɒktəz dɪɡɹˈiː], \d_ˈɒ_k_t_ə_z d_ɪ_ɡ_ɹ_ˈiː]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd