SELACHOSTOMI

\sˌɛlɐt͡ʃəstˈə͡ʊmi], \sˌɛlɐt‍ʃəstˈə‍ʊmi], \s_ˌɛ_l_ɐ_tʃ_ə_s_t_ˈəʊ_m_i]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.