The Collaborative International Dictionary of English v.0.48:

Parch \Parch\, v. i.
   To become scorched or superficially burnt; to be very dry.
   "Parch in Afric sun." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Parch \Parch\ (p[aum]rch), v. t. [imp. & p. p. Parched; p. pr.
   & vb. n. Parching.] [OE. perchen to pierce, hence used of a
   piercing heat or cold, OF. perchier, another form of percier,
   F. percer. See Pierce.]
   1. To burn the surface of; to scorch; to roast over the fire,
      as dry grain; as, to parch the skin; to parch corn.
      [1913 Webster]

            Ye shall eat neither bread, nor parched corn. --Lev.
                                                  xxiii. 14.
      [1913 Webster]

   2. To dry to extremity; to shrivel with heat; as, the mouth
      is parched from fever.
      [1913 Webster]

            The ground below is parched.          --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

parch
    v 1: cause to wither or parch from exposure to heat; "The sun
         parched the earth" [syn: parch, sear]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "parch":
   Sanforize, air-dry, anhydrate, attenuate, bake, be in heat, blaze,
   blister, bloom, blot, boil, brand, broil, brush, burn, burn in,
   burn off, cast, cauterize, char, choke, coal, combust, consume,
   cook, crack, cupel, cure, dehumidify, dehydrate, desiccate, drain,
   dry, dry up, emacerate, emaciate, evaporate, exsiccate, fire,
   flame, flame up, flare, flare up, flicker, flush, found, fry, gasp,
   glow, incandesce, insolate, kiln, macerate, mummify, oxidate,
   oxidize, pant, preshrink, pyrolyze, radiate heat, roast, rub,
   scald, scorch, sear, seethe, shimmer with heat, shrink, shrivel,
   shrivel up, simmer, singe, smoke, smolder, smother, soak up,
   solder, spark, sponge, steam, stew, stifle, suffocate, sun,
   sun-dry, swab, sweat, swelter, swinge, thin, toast, torrefy, towel,
   vesicate, vulcanize, waste, waste away, weazen, weld, wipe, wither,
   wizen