PNEUMONOCONIOSIS

\njˌuːmənəkˈə͡ʊnɪˈə͡ʊsɪs], \njˌuːmənəkˈə‍ʊnɪˈə‍ʊsɪs], \n_j_ˌuː_m_ə_n_ə_k_ˈəʊ_n_ɪ__ˈəʊ_s_ɪ_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland