The Collaborative International Dictionary of English v.0.48:

Creosol \Cre"o*sol\ (kr[=e]"[-o]*s[=o]l), n. [Creosote +
   phenol.] (Chem.)
   A colorless liquid resembling phenol or carbolic acid,
   homologous with pyrocatechin, and obtained from beechwood tar
   and gum guaiacum. [Written also creasol.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

creosol
    n 1: a colorless to yellow aromatic liquid that is a constituent
         of creosote