The Collaborative International Dictionary of English v.0.48:

Wither \With"er\, v. i. [imp. & p. p. Withered; p. pr. & vb.
   n. Withering.] [OE. wideren; probably the same word as
   wederen to weather (see Weather, v. & n.); or cf. G.
   verwittern to decay, to be weather-beaten, Lith. vysti to
   wither.]
   [1913 Webster]
   1. To fade; to lose freshness; to become sapless; to become
      sapless; to dry or shrivel up.
      [1913 Webster]

            Shall he hot pull up the roots thereof, and cut off
            the fruit thereof, that it wither?    --Ezek. xvii.
                                                  9.
      [1913 Webster]

   2. To lose or want animal moisture; to waste; to pin? away,
      as animal bodies.
      [1913 Webster]

            This is man, old, wrinkled, faded, withered. --Shak.
      [1913 Webster]

            There was a man which had his hand withered. --Matt.
                                                  xii. 10.
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            Now warm in love, now with'ring in the grave.
                                                  --Dryden.
      [1913 Webster]

   3. To lose vigor or power; to languish; to pass away. "Names
      that must not wither." --Byron.
      [1913 Webster]

            States thrive or wither as moons wax and wane.
                                                  --Cowper.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Withered \With"ered\, a.
   Faded; dried up; shriveled; wilted; wasted; wasted away. --
   With"ered*ness, n. --Bp. Hall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

withered
    adj 1: lean and wrinkled by shrinkage as from age or illness;
           "the old woman's shriveled skin"; "he looked shriveled
           and ill"; "a shrunken old man"; "a lanky scarecrow of a
           man with withered face and lantern jaws"-W.F.Starkie; "he
           did well despite his withered arm"; "a wizened little man
           with frizzy grey hair" [syn: shriveled, shrivelled,
           shrunken, withered, wizen, wizened]
    2: (used especially of vegetation) having lost all moisture;
       "dried-up grass"; "the desert was edged with sere
       vegetation"; "shriveled leaves on the unwatered seedlings";
       "withered vines" [syn: dried-up, sere, sear,
       shriveled, shrivelled, withered]

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "withered":
   Sanforized, adust, anile, atrophied, attenuated, baked, brittle,
   burnt, cadaverous, consumed, corky, corpselike, crabbed,
   debilitated, decrepit, dehydrated, desiccated, doddered, doddering,
   doddery, dried, dried-up, emacerated, emaciate, emaciated,
   evaporated, exsiccated, feeble, fossilized, gerontal, gerontic,
   haggard, hollow-eyed, infirm, jejune, marantic, marasmic,
   mossbacked, moth-eaten, mummified, mummylike, palsied, papery,
   papery-skinned, parched, parchmenty, peaked, peaky, pinched, poor,
   preshrunk, puny, ravaged with age, rickety, run to seed, rusty,
   scorched, sear, seared, senile, sere, shaky, shriveled,
   shriveled up, shrunk, shrunken, skeletal, starved, starveling,
   stricken in years, sun-dried, sunbaked, tabetic, tabid, thin,
   timeworn, tottering, tottery, underfed, undernourished, wasted,
   wasted away, weak, weazened, weazeny, wilted, wind-dried, wizen,
   wizen-faced, wizened, wraithlike, wrinkled