ACANTHOPTERYGII

\ɐkˈanθəptəɹˌɪd͡ʒɪˌa͡ɪ], \ɐkˈanθəptəɹˌɪd‍ʒɪˌa‍ɪ], \ɐ_k_ˈa_n_θ_ə_p_t_ə_ɹ_ˌɪ_dʒ_ɪ__ˌaɪ]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd