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. 2. (Bot.) The plant which bears this fruit; the grapevine. 3. (Man.) A mangy tumor on the leg of a horse. 4. (Mil.) Grapeshot. Grape borer. (Zo["o]l.) See Vine borer. Grape curculio (Zo["o]l.), 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 (Zo["o]l.), a small yellow and red hemipterous insect, often very injurious to the leaves of the grapevine. Grape moth (Zo["o]l.), 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 (Zo["o]l.), 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.