SIDEREAL HOUR

\sa͡ɪdˈi͡əɹɪə͡l ˈa͡ʊ͡ə], \sa‍ɪdˈi‍əɹɪə‍l ˈa‍ʊ‍ə], \s_aɪ_d_ˈiə_ɹ_ɪ__əl ˈaʊə]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd