ATRIOVENTRICULAR

\ˌatɹɪˌə͡ʊvɪntɹˈɪkjʊlə], \ˌatɹɪˌə‍ʊvɪntɹˈɪkjʊlə], \ˌa_t_ɹ_ɪ__ˌəʊ_v_ɪ_n_t_ɹ_ˈɪ_k_j_ʊ_l_ə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland