Etymology
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anode (n.)

1834, coined from Greek anodos "way upward," from ano "upward," from ana "up" (see ana-) + hodos "a way," a word of uncertain origin (see Exodus). Proposed by the Rev. William Whewell, English polymath, and published by English chemist and physicist Michael Faraday. So called from the path the electrical current was thought to take. Compare cathode. Related: Anodic, anodal.

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Definitions of anode

anode (n.)
a positively charged electrode by which electrons leave an electrical device;
anode (n.)
the negatively charged terminal of a voltaic cell or storage battery that supplies current;
From wordnet.princeton.edu