Electrode

(a) The terminal of an open electric circuit. (b) The terminals of the metallic or solid conductors of an electric circuit, immersed in an electrolytic solution. (c) The terminals between which a voltaic arc is formed, always in practice made of carbon, are termed electrodes. (d) In electro-therapeutics many different electrodes are used whose names are generally descriptive of their shape, character, or uses to which they are to be applied. Such are aural electrodes for the ears, and many others. (e) The plates of a voltaic battery.