CUMULONIMBUS

\kjˈuːmjʊlˌɒnɪmbəs], \kjˈuːmjʊlˌɒnɪmbəs], \k_j_ˈuː_m_j_ʊ_l_ˌɒ_n_ɪ_m_b_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd