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tantalum▼(A metallic chemical element with an atomic number of 73.)noun[UK: ˈtæn.tə.ləm] [US: ˈtæn.tə.ləm]
octane number▼(measure of the antiknock properties of an automobile fuel)noun[UK: ˈɒk.teɪn ˈnʌm.bə(r)] [US: ˈɑːk.ten ˈnʌm.br̩]
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