The Collaborative International Dictionary of English v.0.48:

geraniol \ge*ra"ni*ol\, n. [See Geranium.] (Chem.)
   A terpene alcohol (C10H18O) which constitutes the principal
   part of the oil of palmarosa and the oil of rose. Chemically
   it is 3,7-Dimethyl-2,6-octadien-1-ol. It has a sweet rose
   odor. --MI11
   [PJC]