[1] : The Collaborative International Dictionary of English v.0.48

thaw \thaw\ thadd, v. i. imp.  p. p. thawed thaddd;
   p. pr.  vb. n. thawing. as. thorn=awian,
   thorn=awan; akin to d. dovijen, g. tauen, thauen cf.
   also verdauen to digest, ohg. douwen, firdouwen, icel.
   thorneyja, sw. t"oa, dan. t"oe, and perhaps to gr.
   th`kein to melt. root56.
   1. to melt, dissolve, or become fluid; to soften; -- said of
      that which is frozen; as, the ice thaws.
      1913 webster

   2. to become so warm as to melt ice and snow; -- said in
      reference to the weather, and used impersonally.
      1913 webster

   3. fig.: to grow gentle or genial. compare cold4, a. and
      hard6, a.
      1913 webster +pjc
see also:
thawed thawing cold hard 

[2] : WordNet (r) 2.0

thawing
     n 1: the process whereby heat changes something from a solid to a
          liquid; "the power failure caused a refrigerator melt
          that was a disaster"; "the thawing of a frozen turkey
          takes several hours" syn: thaw, melt, melting
     2: warm weather following a freeze; snow and ice melt; "they
        welcomed the spring thaw" syn: thaw, warming
see also:
thaw melt melting warming 

[3] : Moby Thesaurus II by Grady Ward, 1.0

30 moby thesaurus words for "thawing":
   colliquation, colliquative, decoagulation, deliquescence,
   deliquium, dissolution, dissolutional, dissolutive, dissolving,
   fluidification, fluidization, fusibility, fusing, fusion, leaching,
   liquation, liquefaction, liquefactive, liquefying, liquescence,
   liquescency, lixiviation, melting, percolation, running,
   solubilization, solution, thaw, thermoplasticity, unclotting

Thawing >> T Words
Thawing, definition of term: Thawing
thawing_pag1.html