The Collaborative International Dictionary of English v.0.48:

Rhigolene \Rhig"o*lene\, n. [Gr. ??? cold + L. oleum oil.]
   (Chem.)
   A mixture of volatile hydrocarbons intermediate between
   gsolene and cymogene. It is obtained in the purification of
   crude petroleum, and is used as a refregerant.
   [1913 Webster]