MONOATOMIC

\mˌɒnə͡ʊɐtˈɒmɪk], \mˌɒnə‍ʊɐtˈɒmɪk], \m_ˌɒ_n_əʊ_ɐ_t_ˈɒ_m_ɪ_k]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd