inositol Syllabification: (in·o·si·tol)Pronunciation: /iˈnōsiˌtôl, -ˌtäl, īˈnō-/Definition of inositol noun Biochemistry a simple carbohydrate that occurs in animal and plant tissue and is a vitamin of the B group. Alternative name: hexahydroxycyclohexane; chemical formula: C6H12O6 Origin: late 19th century: from the earlier name inosite + -olinositol in other Oxford dictionaries Definition of inositol in the British & World English dictionary