ACROCERAUNIAN

\ˌakɹə͡ʊsɹˈɔːni͡ən], \ˌakɹə‍ʊsɹˈɔːni‍ən], \ˌa_k_ɹ_əʊ_s_ɹ_ˈɔː_n_iə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.