PERISTOMIAL

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