BIVALVULAR

\ba͡ɪvˈalvjʊlə], \ba‍ɪvˈalvjʊlə], \b_aɪ_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.
 
1899 - The american dictionary of the english language.
By Daniel Lyons