HYDROXIDE ION

\ha͡ɪdɹˈɒksa͡ɪd ˈa͡ɪɒn], \ha‍ɪdɹˈɒksa‍ɪd ˈa‍ɪɒn], \h_aɪ_d_ɹ_ˈɒ_k_s_aɪ_d ˈaɪ_ɒ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd