The Collaborative International Dictionary of English v.0.48:

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.
       [1913 Webster]