Source : Webster's Revised Unabridged Dictionary (1913)

Anode \An"ode\, n. [Gr. ? up + ? way.] (Elec.)
   The positive pole of an electric battery, or more strictly
   the electrode by which the current enters the electrolyte on
   its way to the other pole; -- opposed to {cathode}.

Source : WordNet®

anode
     n 1: a positively charged electrode by which electrons leave an
          electrical device [ant: {cathode}]
     2: the negatively charged terminal of a voltaic cell or storage
        battery that supplies current [ant: {cathode}]