An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte or a vacuum). The word was coined by the scientist Michael Faraday from the Greek words elektron (meaning amber, from which the word electricity is derived) and hodos, a way.
Read more about Electrode: Anode and Cathode in Electrochemical Cells, Other Anodes and Cathodes, Welding Electrodes, Alternating Current Electrodes, Uses, Chemically Modified Electrodes