The Collaborative International Dictionary of English v.0.48:

Glucose \Glu"cose`\, n. [Gr. ? sweet. Cf. Glycerin.]
   [1913 Webster]
   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.
      [1913 Webster]

   2. (Chem.) Any one of a large class of sugars, isometric with
      glucose proper, and including levulose, galactose, etc.
      [1913 Webster]

   3. The trade name of a sirup, obtained as an uncrystallizable
      reside in the manufacture of glucose proper, and
      containing, in addition to some dextrose or glucose, also
      maltose, dextrin, etc. It is used as a cheap adulterant of
      sirups, beers, etc.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grape \Grape\, n. [OF. grape, crape, bunch or cluster of grapes,
   F. grappe, akin to F. grappin grapnel, hook; fr. OHG. chrapfo
   hook, G. krapfen, akin to E. cramp. The sense seems to have
   come from the idea of clutching. Cf. Agraffe, Cramp,
   Grapnel, Grapple.]
   1. (Bot.) A well-known edible berry growing in pendent
      clusters or bunches on the grapevine. The berries are
      smooth-skinned, have a juicy pulp, and are cultivated in
      great quantities for table use and for making wine and
      raisins.
      [1913 Webster]

   2. (Bot.) The plant which bears this fruit; the grapevine.
      [1913 Webster]

   3. (Man.) A mangy tumor on the leg of a horse.
      [1913 Webster]

   4. (Mil.) Grapeshot.
      [1913 Webster]

   Grape borer. (Zool.) See Vine borer.

   Grape curculio (Zool.), a minute black weevil (Craponius
      in[ae]qualis) which in the larval state eats the interior
      of grapes.

   Grape flower, or

   Grape hyacinth (Bot.), a liliaceous plant (Muscari
      racemosum) with small blue globular flowers in a dense
      raceme.

   Grape fungus (Bot.), a fungus (Oidium Tuckeri) on
      grapevines; vine mildew.

   Grape hopper (Zool.), a small yellow and red hemipterous
      insect, often very injurious to the leaves of the
      grapevine.

   Grape moth (Zool.), a small moth (Eudemis botrana), which
      in the larval state eats the interior of grapes, and often
      binds them together with silk.

   Grape of a cannon, the cascabel or knob at the breech.

   Grape sugar. See Glucose.

   Grape worm (Zool.), the larva of the grape moth.

   Sour grapes, things which persons affect to despise because
      they can not possess them; -- in allusion to [AE]sop's
      fable of the fox and the grapes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sugar \Sug"ar\, n. [OE. sugre, F. sucre (cf. It. zucchero, Sp.
   az['u]car), fr. Ar. sukkar, assukkar, fr. Skr. [,c]arkar[=a]
   sugar, gravel; cf. Per. shakar. Cf. Saccharine, Sucrose.]
   1. A sweet white (or brownish yellow) crystalline substance,
      of a sandy or granular consistency, obtained by
      crystallizing the evaporated juice of certain plants, as
      the sugar cane, sorghum, beet root, sugar maple, etc. It
      is used for seasoning and preserving many kinds of food
      and drink. Ordinary sugar is essentially sucrose. See the
      Note below.
      [1913 Webster]

   Note: The term sugar includes several commercial grades, as
         the white or refined, granulated, loaf or lump, and the
         raw brown or muscovado. In a more general sense, it
         includes several distinct chemical compounds, as the
         glucoses, or grape sugars (including glucose proper,
         dextrose, and levulose), and the sucroses, or true
         sugars (as cane sugar). All sugars are carbohydrates.
         See Carbohydrate. The glucoses, or grape sugars, are
         ketone alcohols of the formula C6H12O6, and they turn
         the plane of polarization to the right or the left.
         They are produced from the amyloses and sucroses, as by
         the action of heat and acids of ferments, and are
         themselves decomposed by fermentation into alcohol and
         carbon dioxide. The only sugar (called acrose) as yet
         produced artificially belongs to this class. The
         sucroses, or cane sugars, are doubled glucose
         anhydrides of the formula C12H22O11. They are usually
         not fermentable as such (cf. Sucrose), and they act
         on polarized light.
         [1913 Webster]

   2. By extension, anything resembling sugar in taste or
      appearance; as, sugar of lead (lead acetate), a poisonous
      white crystalline substance having a sweet taste.
      [1913 Webster]

   3. Compliment or flattery used to disguise or render
      acceptable something obnoxious; honeyed or soothing words.
      [Colloq.]
      [1913 Webster]

   Acorn sugar. See Quercite.

   Cane sugar, sugar made from the sugar cane; sucrose, or an
      isomeric sugar. See Sucrose.

   Diabetes sugar, or Diabetic sugar (Med. Chem.), a variety
      of sugar (grape sugar or dextrose) excreted in the urine
      in diabetes mellitus; -- the presence of such a sugar in
      the urine is used to diagnose the illness.

   Fruit sugar. See under Fruit, and Fructose.

   Grape sugar, a sirupy or white crystalline sugar (dextrose
      or glucose) found as a characteristic ingredient of ripe
      grapes, and also produced from many other sources. See
      Dextrose, and Glucose.

   Invert sugar. See under Invert.

   Malt sugar, a variety of sugar isomeric with sucrose, found
      in malt. See Maltose.

   Manna sugar, a substance found in manna, resembling, but
      distinct from, the sugars. See Mannite.

   Milk sugar, a variety of sugar characteristic of fresh
      milk, and isomeric with sucrose. See Lactose.

   Muscle sugar, a sweet white crystalline substance isomeric
      with, and formerly regarded to, the glucoses. It is found
      in the tissue of muscle, the heart, liver, etc. Called
      also heart sugar. See Inosite.

   Pine sugar. See Pinite.

   Starch sugar (Com. Chem.), a variety of dextrose made by
      the action of heat and acids on starch from corn,
      potatoes, etc.; -- called also potato sugar, corn
      sugar, and, inaccurately, invert sugar. See Dextrose,
      and Glucose.

   Sugar barek, one who refines sugar.

   Sugar beet (Bot.), a variety of beet (Beta vulgaris) with
      very large white roots, extensively grown, esp. in Europe,
      for the sugar obtained from them.

   Sugar berry (Bot.), the hackberry.

   Sugar bird (Zool.), any one of several species of small
      South American singing birds of the genera Coereba,
      Dacnis, and allied genera belonging to the family
      Coerebidae. They are allied to the honey eaters.

   Sugar bush. See Sugar orchard.

   Sugar camp, a place in or near a sugar orchard, where maple
      sugar is made.

   Sugar candian, sugar candy. [Obs.]

   Sugar candy, sugar clarified and concreted or crystallized;
      candy made from sugar.

   Sugar cane (Bot.), a tall perennial grass (Saccharum
      officinarium), with thick short-jointed stems. It has
      been cultivated for ages as the principal source of sugar.


   Sugar loaf.
      (a) A loaf or mass of refined sugar, usually in the form
          of a truncated cone.
      (b) A hat shaped like a sugar loaf.
          [1913 Webster]

                Why, do not or know you, grannam, and that sugar
                loaf?                             --J. Webster.
          [1913 Webster]

   Sugar maple (Bot.), the rock maple (Acer saccharinum).
      See Maple.

   Sugar mill, a machine for pressing out the juice of the
      sugar cane, usually consisting of three or more rollers,
      between which the cane is passed.

   Sugar mite. (Zool.)
      (a) A small mite (Tyroglyphus sacchari), often found in
          great numbers in unrefined sugar.
      (b) The lepisma.

   Sugar of lead. See Sugar, 2, above.

   Sugar of milk. See under Milk.

   Sugar orchard, a collection of maple trees selected and
      preserved for purpose of obtaining sugar from them; --
      called also, sometimes, sugar bush. [U.S.] --Bartlett.

   Sugar pine (Bot.), an immense coniferous tree (Pinus
      Lambertiana) of California and Oregon, furnishing a soft
      and easily worked timber. The resinous exudation from the
      stumps, etc., has a sweetish taste, and has been used as a
      substitute for sugar.

   Sugar squirrel (Zool.), an Australian flying phalanger
      (Belideus sciureus), having a long bushy tail and a
      large parachute. It resembles a flying squirrel. See
      Illust. under Phlanger.

   Sugar tongs, small tongs, as of silver, used at table for
      taking lumps of sugar from a sugar bowl.

   Sugar tree. (Bot.) See Sugar maple, above.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dextrose \Dex"trose`\ (d[e^]ks"tr[=o]s`), n. [See Dexter.]
   (Chem.)
   A sirupy, or white crystalline, variety of sugar, C6H12O6
   (so called from turning the plane of polarization to the
   right), occurring in many ripe fruits, and also called
   glucose. Dextrose and levulose are obtained by the
   inversion of cane sugar or sucrose, and hence the mixture is
   called called invert sugar. Dextrose is chiefly obtained by
   the action of heat and acids on starch, and hence called also
   starch sugar. It is also formed from starchy food by the
   action of the amylolytic ferments of saliva and pancreatic
   juice.
   [1913 Webster]

   Note: The solid products are known to the trade as grape
         sugar; the sirupy products as glucose, or mixing
         sirup. These are harmless, but are only about half as
         sweet as cane sugar or sucrose. Dextrously
         Dextrous

WordNet (r) 3.0 (2006):

grape sugar
    n 1: an isomer of glucose that is found in honey and sweet
         fruits [syn: dextrose, dextroglucose, grape sugar]