PENTOXIDE

\pɛntˈɒksa͡ɪd], \pɛntˈɒksa‍ɪd], \p_ɛ_n_t_ˈɒ_k_s_aɪ_d]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop