SELENONIUM

\sˌɛlənˈə͡ʊni͡əm], \sˌɛlənˈə‍ʊni‍əm], \s_ˌɛ_l_ə_n_ˈəʊ_n_iə_m]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.