MONOCARBONIC

\mˌɒnə͡ʊkɑːbˈɒnɪk], \mˌɒnə‍ʊkɑːbˈɒnɪk], \m_ˌɒ_n_əʊ_k_ɑː_b_ˈɒ_n_ɪ_k]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.