MELOLONTHIDIAN

\mˌɛlələnθˈɪdi͡ən], \mˌɛlələnθˈɪdi‍ən], \m_ˌɛ_l_ə_l_ə_n_θ_ˈɪ_d_iə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.