The Collaborative International Dictionary of English v.0.48:

Shrivel \Shriv"el\, v. i. [imp. & p. p. Shriveledor
   Shrivelled; p. pr. & vb. n. Shriveling or Shrivelling.]
   [Probably akin to shrimp, shrink; cf. dial. AS. screpa to
   pine away, Norw. skrypa to waste, skryp, skryv, transitory,
   frail, Sw. skr["o]pling feeble, Dan. skr["o]belig, Icel.
   skrj?pr brittle, frail.]
   To draw, or be drawn, into wrinkles; to shrink, and form
   corrugations; as, a leaf shriveles in the hot sun; the skin
   shrivels with age; -- often with up.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shrivel \Shriv"el\, v. t.
   To cause to shrivel or contract; to cause to shrink onto
   corruptions.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shrivel
    v 1: wither, as with a loss of moisture; "The fruit dried and
         shriveled" [syn: shrivel, shrivel up, shrink,
         wither]
    2: decrease in size, range, or extent; "His earnings shrank";
       "My courage shrivelled when I saw the task before me" [syn:
       shrink, shrivel]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "shrivel":
   Sanforize, age, air-dry, anhydrate, attenuate, bake, blot, brush,
   burn, cheat the undertaker, consume, contract, cure, curl up,
   decline, dehumidify, dehydrate, desiccate, diminish, dodder, drain,
   droop, dry, dry up, emacerate, emaciate, evaporate, exsiccate,
   fade, fade away, fail, fire, flag, fossilize, get along, get on,
   grow old, insolate, kiln, languish, macerate, mummify, mummy,
   parch, pine, preshrink, pucker up, rub, scorch, sear, shake,
   shrink, shrivel up, sink, smoke, soak up, sponge, sun, sun-dry,
   swab, thin, torrefy, totter, towel, turn gray, turn white, wane,
   waste, waste away, weazen, welter, wilt, wipe, wither, wizen,
   wrinkle