OPERCULATE

\ˈɒpəkjˌʊle͡ɪt], \ˈɒpəkjˌʊle‍ɪt], \ˈɒ_p_ə_k_j_ˌʊ_l_eɪ_t]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.