NI-HARD IRON

\nˈa͡ɪhˈɑːd ˈa͡ɪ͡ən], \nˈa‍ɪhˈɑːd ˈa‍ɪ‍ən], \n_ˈaɪ_h_ˈɑː_d ˈaɪə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd