cyclohexylPronunciation: /ˌsʌɪklə(ʊ)ˈhɛksʌɪl, -sɪl/Definition of cyclohexyl noun [as modifier] Chemistry of or denoting the cyclic hydrocarbon radical C6H11, derived from cyclohexane. cyclohexyl in other Oxford dictionaries Definition of cyclohexyl in the US English dictionary