The Collaborative International Dictionary of English v.0.48:

Electrode \E*lec"trode\ ([-e]*l[e^]k"tr[=o]d), n. [Electro- +
   Gr. "odo`s way, path: cf. F. ['e]lectrode.] (Elec.)
   a conducting object by which electricity is conveyed into or
   from a solution or other non-metallic conducting medium;
   esp., the ends of the wires or conductors, leading from
   source of electricity, and terminating in the medium
   traversed by the current.

   Note: Electrodes may be specially designed or made of a
         special material for particular purposes, as for
         example silver electrodes used in electroplating.
         [1913 Webster +PJC] Electro-dynamic

WordNet (r) 3.0 (2006):

electrode
    n 1: a conductor used to make electrical contact with some part
         of a circuit