Source : Webster's Revised Unabridged Dictionary (1913)

Wilt \Wilt\, v. i. [imp. & p. p. {Wilting}.] [Written also welt,
   a modification of welk.]
   To begin to wither; to lose freshness and become flaccid, as
   a plant when exposed when exposed to drought, or to great
   heat in a dry day, or when separated from its root; to
   droop;. to wither. [Prov. Eng. & U. S.]

Source : WordNet®

wilting
     n : causing to become limp or drooping [syn: {wilt}]