The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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]