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]