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]

WordNet (r) 3.0 (2006):

grape
    n 1: any of various juicy fruit of the genus Vitis with green or
         purple skins; grow in clusters
    2: any of numerous woody vines of genus Vitis bearing clusters
       of edible berries [syn: grape, grapevine, grape vine]
    3: a cluster of small projectiles fired together from a cannon
       to produce a hail of shot [syn: grapeshot, grape]

Easton's 1897 Bible Dictionary:

Grape
   the fruit of the vine, which was extensively cultivated in
   Palestine. Grapes are spoken of as "tender" (Cant. 2:13, 15),
   "unripe" (Job 15:33), "sour" (Isa. 18:5), "wild" (Isa. 5:2,4).
   (See Rev. 14:18; Micah 7:1; Jer. 6:9; Ezek. 18:2, for figurative
   use of the word.) (See VINE.)


The Devil's Dictionary (1881-1906):

GRAPE, n.

    Hail noble fruit! -- by Homer sung,
        Anacreon and Khayyam;
    Thy praise is ever on the tongue
        Of better men than I am.

    The lyre in my hand has never swept,
        The song I cannot offer:
    My humbler service pray accept --
        I'll help to kill the scoffer.

    The water-drinkers and the cranks
        Who load their skins with liquor --
    I'll gladly bear their belly-tanks
        And tap them with my sticker.

    Fill up, fill up, for wisdom cools
        When e'er we let the wine rest.
    Here's death to Prohibition's fools,
        And every kind of vine-pest!
                                                       Jamrach Holobom