cymene

from WordNet (r) 3.0 (2006)

cymene
    n 1: any of three isotopes of a colorless aromatic liquid
         hydrocarbon occurring in the volatile oil of cumin and
         thyme and used in the manufacture of synthetic resins

from 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]