Source : Webster's Revised Unabridged Dictionary (1913)

Glucose \Glu"cose`\, n. [Gr. ? sweet. Cf. {Glycerin}.]
   1. A variety of sugar occurring in nature very abundantly, as
      in ripe grapes, and in honey, and produced in great
      quantities from starch, etc., by the action of heat and
      acids. It is only about half as sweet as cane sugar.
      Called also {dextrose}, {grape sugar}, {diabetic sugar},
      and {starch sugar}. See {Dextrose}.

   2. (Chem.) Any one of a large class of sugars, isometric with
      glucose proper, and including levulose, galactose, etc.

Source : WordNet®

glucose
     n : a monosaccharide sugar that has several forms; an important
         source of physiological energy