Source : Webster's Revised Unabridged Dictionary (1913)

Creosote \Cre"o*sote\, v. t. [imp. & p. p. {Creosoted}
   (-s?"t?d); p. pr. & vb. n. {Creosoting}.]
   To saturate or impregnate with creosote, as timber, for the
   prevention of decay.

Creosote \Cre"o*sote\ (kr?"?-s?t), n. [Gr. ???, gen. ???, flesh
   + ??? to preserve.] (Chem.)
   Wood-tar oil; an oily antiseptic liquid, of a burning smoky
   taste, colorless when pure, but usually colored yellow or
   brown by impurity or exposure. It is a complex mixture of
   various phenols and their ethers, and is obtained by the
   distillation of wood tar, especially that of beechwood.

   Note: It is remarkable as an antiseptic and deodorizer in the
         preservation of wood, flesh, etc., and in the
         prevention of putrefaction; but it is a poor germicide,
         and in this respect has been overrated. Smoked meat, as
         ham, owes its preservation and taste to a small
         quantity of creosote absorbed from the smoke to which
         it is exposed. Carbolic acid is phenol proper, while
         creosote is a mixture of several phenols.

   {Coal-tar creosote} (Chem.), a colorless or yellow, oily
      liquid, obtained in the distillation of coal tar, and
      resembling wood-tar oil, or creosote proper, in
      composition and properties.

Source : WordNet®

creosote
     n 1: a colorless or yellowish oily liquid obtained by
          distillation of wood tar; used as an antiseptic
     2: a dark oily liquid obtained by distillation of coal tar;
        used as a preservative for wood [syn: {coal-tar creosote}]
     v : treat with creosote; "creosoted wood"