geraniol Syllabification: (ge·ra·ni·ol)Pronunciation: /jəˈrānēˌôl, -ˌäl/Definition of geraniol noun Chemistry a fragrant liquid present in some floral oils and used in perfumery. A terpenoid alcohol; chemical formula: C10H18O Origin: late 19th century: from German, from geranium+ -olgeraniol in other Oxford dictionaries Definition of geraniol in the British & World English dictionary