Source : Webster's Revised Unabridged Dictionary (1913)

Denudation \Den`u*da"tion\ (?; 277), n. [L. denudatio: cf. F.
   d['e]nudation.]
   1. The act of stripping off covering, or removing the
      surface; a making bare.

   2. (Geol.) The laying bare of rocks by the washing away of
      the overlying earth, etc.; or the excavation and removal
      of them by the action of running water.

Source : WordNet®

denudation
     n : the removal of covering [syn: {stripping}, {uncovering}, {baring},
          {husking}]