PLEUROPERITONEAL

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