cyclohexanePronunciation: /ˌsʌɪklə(ʊ)ˈhɛkseɪn/Definition of cyclohexane noun [mass noun] Chemistry a colourless flammable liquid cycloalkane obtained from petroleum or by hydrogenating benzene, and used as a solvent and paint remover. Chemical formula: C6H12 cyclohexane in other Oxford dictionaries Definition of cyclohexane in the US English dictionary