Source : Webster's Revised Unabridged Dictionary (1913)

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}.

Source : WordNet®

thymol
     n : a colorless crystalline solid used in perfume or preserving
         biological specimens or in embalming or medically as a
         fungicide or antiseptic [syn: {thyme camphor}, {thymic
         acid}]