The Collaborative International Dictionary of English v.0.48:

Thymol \Thym"ol\, n. [Thyme + -ol.] (Chem.)
   A phenol derivative of cymene, C10H13.OH, isomeric with
   carvacrol, found in oil of thyme, and extracted as a white
   crystalline substance of a pleasant aromatic odor and strong
   antiseptic properties; -- called also hydroxy cymene.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Carvacrol \Car"va*crol\ (k[aum]r"v[.a]*kr[=o]l), n. (Chem.)
   A thick oily liquid, C10H13.OH, of a strong taste and
   disagreeable odor, obtained from oil of caraway (Carum
   carui).
   [1913 Webster]