DECILLIONTH

\dˈɛsɪlˌi͡ənθ], \dˈɛsɪlˌi‍ənθ], \d_ˈɛ_s_ɪ_l_ˌiə_n_θ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.