MYELENCEPHALOUS

\mˈa͡ɪɪlənsˌɛfələs], \mˈa‍ɪɪlənsˌɛfələs], \m_ˈaɪ_ɪ_l_ə_n_s_ˌɛ_f_ə_l_ə_s]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.