PRODUCT RESEARCH

\pɹˈɒdʌkt ɹɪsˈɜːt͡ʃ], \pɹˈɒdʌkt ɹɪsˈɜːt‍ʃ], \p_ɹ_ˈɒ_d_ʌ_k_t ɹ_ɪ_s_ˈɜː_tʃ]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black