anode

Definitions

Computing

Construction

  • The conductor rod used in an electrical system to protect underground tanks and pipes from electrochemical action.

Electronics

  • The positive electrode in an electron tube. Electrons emitted by the cathode travel towards it. Also known as plate (1).
  • The positive electrode in an electrolytic cell. When a current is passed through the cell, negative ions travel towards it.
  • The electrode where oxidation occurs in an electrochemical cell.

Origin & History of “anode”

The term anode, meaning ‘positive electrode’, appears to have been introduced by the English philosopher William Whewell around 1834. It was based on Greek ánodos ‘way up’, a compound noun formed from aná- ‘up’ and hodós ‘way’ (also represented in exodus ‘way out’ and odometer ‘instrument for measuring distance travelled’, and possibly related to Latin cēdere, source of English cede and a host of derived words). It specifically contrasts with cathode, which means literally ‘way down’.
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