Source : Webster's Revised Unabridged Dictionary (1913)

Glycol \Gly"col\, n. [Glycerin + -ol. See {Glycerin}.] (Chem.)
   (a) A thick, colorless liquid, {C2H4(OH)2}, of a sweetish
       taste, produced artificially from certain ethylene
       compounds. It is a diacid alcohol, intermediate between
       ordinary ethyl alcohol and glycerin.

Source : WordNet®

glycol
     n 1: a sweet but poisonous syrupy liquid used as an antifreeze
          and solvent [syn: {ethylene glycol}, {ethanediol}]
     2: any of a class of alcohols having 2 hydroxyl groups in each
        molecule [syn: {diol}, {dihydric alcohol}]