The Collaborative International Dictionary of English v.0.48:

Cymene \Cy"mene\ (s?"m?n), n. (Chem.)
   A colorless, liquid, combustible hydrocarbon,
   CH3.C6H4.C3H7, of pleasant odor, obtained from oil of
   cumin, oil of caraway, carvacrol, camphor, etc.; -- called
   also paracymene, and formerly camphogen.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Camphogen \Cam"pho*gen\, n. [Camphor + -gen: -- formerly so
   called as derived from camphor: cf. F. camphog[`e]ne.]
   (Chem.)
   See Cymene.
   [1913 Webster]