The Collaborative International Dictionary of English v.0.48:

Wheat \Wheat\ (hw[=e]t), n. [OE. whete, AS. hw[=ae]te; akin to
   OS. hw[=e]ti, D. weit, G. weizen, OHG. weizzi, Icel. hveiti,
   Sw. hvete, Dan. hvede, Goth. hwaiteis, and E. white. See
   White.] (Bot.)
   A cereal grass (Triticum vulgare) and its grain, which
   furnishes a white flour for bread, and, next to rice, is the
   grain most largely used by the human race.
   [1913 Webster]

   Note: Of this grain the varieties are numerous, as red wheat,
         white wheat, bald wheat, bearded wheat, winter wheat,
         summer wheat, and the like. Wheat is not known to exist
         as a wild native plant, and all statements as to its
         origin are either incorrect or at best only guesses.
         [1913 Webster]

   Buck wheat. (Bot.) See Buckwheat.

   German wheat. (Bot.) See 2d Spelt.

   Guinea wheat (Bot.), a name for Indian corn.

   Indian wheat, or Tartary wheat (Bot.), a grain
      (Fagopyrum Tartaricum) much like buckwheat, but only
      half as large.

   Turkey wheat (Bot.), a name for Indian corn.

   Wheat aphid, or Wheat aphis (Zool.), any one of several
      species of Aphis and allied genera, which suck the sap
      of growing wheat.

   Wheat beetle. (Zool.)
   (a) A small, slender, rusty brown beetle (Sylvanus
       Surinamensis) whose larvae feed upon wheat, rice, and
       other grains.
   (b) A very small, reddish brown, oval beetle (Anobium
       paniceum) whose larvae eat the interior of grains of
       wheat.

   Wheat duck (Zool.), the American widgeon. [Western U. S.]


   Wheat fly. (Zool.) Same as Wheat midge, below.

   Wheat grass (Bot.), a kind of grass (Agropyrum caninum)
      somewhat resembling wheat. It grows in the northern parts
      of Europe and America.

   Wheat jointworm. (Zool.) See Jointworm.

   Wheat louse (Zool.), any wheat aphid.

   Wheat maggot (Zool.), the larva of a wheat midge.

   Wheat midge. (Zool.)
   (a) A small two-winged fly (Diplosis tritici) which is very
       destructive to growing wheat, both in Europe and America.
       The female lays her eggs in the flowers of wheat, and the
       larvae suck the juice of the young kernels and when full
       grown change to pupae in the earth.
   (b) The Hessian fly. See under Hessian.

   Wheat moth (Zool.), any moth whose larvae devour the grains
      of wheat, chiefly after it is harvested; a grain moth. See
      Angoumois Moth, also Grain moth, under Grain.

   Wheat thief (Bot.), gromwell; -- so called because it is a
      troublesome weed in wheat fields. See Gromwell.

   Wheat thrips (Zool.), a small brown thrips (Thrips
      cerealium) which is very injurious to the grains of
      growing wheat.

   Wheat weevil. (Zool.)
   (a) The grain weevil.
   (b) The rice weevil when found in wheat.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Widgeon \Widg"eon\, n. [Probably from an old French form of F.
   vigeon, vingeon, gingeon; of uncertain origin; cf. L. vipio,
   -onis, a kind of small crane.] (Zool.)
   Any one of several species of fresh-water ducks, especially
   those belonging to the subgenus Mareca, of the genus
   Anas. The common European widgeon (Anas penelope) and the
   American widgeon (Anas Americana) are the most important
   species. The latter is called also baldhead, baldpate,
   baldface, baldcrown, smoking duck, wheat, duck, and
   whitebelly.
   [1913 Webster]

   Bald-faced widgeon, or Green-headed widgeon, the American
      widgeon.

   Black widgeon, the European tufted duck.

   Gray widgeon.
   (a) The gadwall.
   (b) The pintail duck.

   Great headed widgeon, the poachard.

   Pied widgeon.
   (a) The poachard.
   (b) The goosander.

   Saw-billed widgeon, the merganser.

   Sea widgeon. See in the Vocabulary.

   Spear widgeon, the goosander. [Prov. Eng.]

   Spoonbilled widgeon, the shoveler.

   White widgeon, the smew.

   Wood widgeon, the wood duck.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wheat
    n 1: annual or biennial grass having erect flower spikes and
         light brown grains
    2: grains of common wheat; sometimes cooked whole or cracked as
       cereal; usually ground into flour [syn: wheat, wheat
       berry]
    3: a variable yellow tint; dull yellow, often diluted with white
       [syn: pale yellow, straw, wheat]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "wheat":
   Bengal grass, English rye grass, Italian rye grass,
   Kentucky bluegrass, alfilaria, bamboo, barley, beach grass,
   beard grass, bent, bent grass, bird seed, black bent, bluegrass,
   bog grass, bran, buckwheat, buffalo grass, bulrush, bunch grass,
   canary grass, cane, cat food, chicken feed, chop, corn,
   cotton grass, crab grass, dog food, eatage, ensilage,
   feather grass, feed, flyaway grass, fodder, forage,
   four-leaved grass, grain, grasses, hassock grass, hay, horsetail,
   little quaking grass, lovegrass, maize, mash, meadow fescue,
   meadow foxtail, meadow grass, meal, millet, myrtle grass, oats,
   paddy, palm-leaved grass, pampas grass, papyrus, pasturage,
   pasture, peppergrass, pet food, provender, reed, ribbon grass,
   rice, rush, rye, scratch, scratch feed, scutch, sedge, sesame,
   sesame grass, silage, slops, sorghum, straw, striped grass,
   sugar cane, swill, switch grass, sword grass, tufted hair grass,
   wild oats, wire grass, woolly beard grass, worm grass, zebra grass,
   zoysia



Easton's 1897 Bible Dictionary:

Wheat
   one of the earliest cultivated grains. It bore the Hebrew name
   _hittah_, and was extensively cultivated in Palestine. There are
   various species of wheat. That which Pharaoh saw in his dream
   was the Triticum compositum, which bears several ears upon one
   stalk (Gen. 41:5). The "fat of the kidneys of wheat" (Deut.
   32:14), and the "finest of the wheat" (Ps. 81:16; 147:14),
   denote the best of the kind. It was exported from Palestine in
   great quantities (1 Kings 5:11; Ezek. 27:17; Acts 12:20).

     Parched grains of wheat were used for food in Palestine (Ruth
   2:14; 1 Sam. 17:17; 2 Sam. 17:28). The disciples, under the
   sanction of the Mosaic law (Deut. 23:25), plucked ears of corn,
   and rubbing them in their hands, ate the grain unroasted (Matt.
   12:1; Mark 2:23; Luke 6:1). Before any of the wheat-harvest,
   however, could be eaten, the first-fruits had to be presented
   before the Lord (Lev. 23:14).


The Devil's Dictionary (1881-1906):

WHEAT, n.  A cereal from which a tolerably good whisky can with some
difficulty be made, and which is used also for bread.  The French are
said to eat more bread _per capita_ of population than any other
people, which is natural, for only they know how to make the stuff
palatable.