ISOMEROMORPHISM

\ˈa͡ɪsə͡ʊmɹˌɒmɔːfˌɪzəm], \ˈa‍ɪsə‍ʊmɹˌɒmɔːfˌɪzəm], \ˈaɪ_s_əʊ_m_ɹ_ˌɒ_m_ɔː_f_ˌɪ_z_ə_m]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.