PEROXIDATION

\pˌɛɹəksɪdˈe͡ɪʃən], \pˌɛɹəksɪdˈe‍ɪʃən], \p_ˌɛ_ɹ_ə_k_s_ɪ_d_ˈeɪ_ʃ_ə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.