OPERCULAR

\ˈɒpəkjˌʊlə], \ˈɒpəkjˌʊlə], \ˈɒ_p_ə_k_j_ˌʊ_l_ə]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland