geraniolPronunciation: /dʒɪˈreɪnɪɒl/Definition of geraniol noun [mass 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 US English dictionary