Source : Webster's Revised Unabridged Dictionary (1913)

Remorse \Re*morse"\ (r?*m?rs"), n. [OE. remors, OF. remors,F.
   remords, LL. remorsus, fr. L. remordere, remorsum, to bite
   again or back, to torment; pref. re- re- + mordere to bite.
   See {Morsel}.]
   1. The anguish, like gnawing pain, excited by a sense of
      guilt; compunction of conscience for a crime committed, or
      for the sins of one's past life. ``Nero will be tainted
      with remorse.'' --Shak.

   2. Sympathetic sorrow; pity; compassion.

            Curse on the unpardoning prince, whom tears can draw
            To no remorse.                        --Dryden.

            But evermore it seem'd an easier thing At once
            without remorse to strike her dead.   --Tennyson.

   Syn: Compunction; regret; anguish; grief; compassion. See
        {Compunction}.

Source : WordNet®

remorse
     n : a feeling of deep regret (usually for some misdeed) [syn: {compunction},
          {self-reproach}]