Source : Webster's Revised Unabridged Dictionary (1913)

Molt \Molt\, Moult \Moult\, v. i. [imp. & p. p. {Molted} or
   {Moulted}; p. pr. & vb. n. {Molting} or {Moulting}.] [OE.
   mouten, L. mutare. See {Mew} to molt, and cf. {Mute}, v. t.]
   [The prevalent spelling is, perhaps, {moult}; but as the {u}
   has not been inserted in the otherwords of this class, as,
   bolt, colt, dolt, etc., it is desirable to complete the
   analogy by the spelling {molt}.]
   To shed or cast the hair, feathers, skin, horns, or the like,
   as an animal or a bird. --Bacon.

Source : WordNet®

moulting
     n : periodic shedding of the cuticle in arthropods or the outer
         skin in reptiles [syn: {molt}, {molting}, {moult}, {ecdysis}]