The Collaborative International Dictionary of English v.0.48:

oenanthol \oe*nan"thol\, n. [oenanthylic + L. oleum oil.]
   (Chem.)
   An oily substance (C6H15.CHO) obtained by the distillation
   of castor oil, recognized as the aldehyde of oenanthylic
   acid, and hence called also oenanthaldehyde.
   [1913 Webster]