DIPHTHERIAL

\dɪfθˈi͡əɹɪə͡l], \dɪfθˈi‍əɹɪə‍l], \d_ɪ_f_θ_ˈiə_ɹ_ɪ__əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.