TESTACEAN

\tɛstˈe͡ɪʃən], \tɛstˈe‍ɪʃən], \t_ɛ_s_t_ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.