PENTADECATOIC

\pˈɛnte͡ɪdkˌatə͡ʊɪk], \pˈɛnte‍ɪdkˌatə‍ʊɪk], \p_ˈɛ_n_t_eɪ_d_k_ˌa_t_əʊ_ɪ_k]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.