EQUIVALVULAR

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