ROUND-BACKED

\ɹˈa͡ʊndbˈakt], \ɹˈa‍ʊndbˈakt], \ɹ_ˈaʊ_n_d_b_ˈa_k_t]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.