Definition of anode in English:



  • 1The positively charged electrode by which the electrons leave an electrical device.

    The opposite of cathode
    • ‘As soon as the circuit of the lead storage battery cell is closed and the cathode and anode are connected, the reaction begins and electrons flow from the anode to the cathode.’
    • ‘Meanwhile, copper atoms in the positive anode give up electrons and dissolve into the electrolyte solution as copper ions.’
    • ‘Gaseous hydrogen and oxygen flow separately around either side of two electrolytic plates serving as anodes and cathodes.’
    • ‘One is a photosensitive cathode which emits electrons when exposed to light and the other is an anode which is maintained at a positive voltage with respect to the cathode.’
    • ‘At one electrode, the anode, molecules of hydrogen gas break down into electrons and positively charged hydrogen ions.’
    1. 1.1 The negatively charged electrode of an electrical device, such as a primary cell, that supplies current.
      • ‘The rods serve as negative electrodes, or anodes, and the tube serves as a positive electrode, or cathode.’
      • ‘Oxygen enters at the cathode, where it combines with electrons and is split into ions that travel through the electrolyte to react with fuel at the anode.’
      • ‘Current can only flow from the anode to the cathode, but not the other direction.’
      • ‘Because electrons originate at the anode in a voltaic cell, the anode has a (-) charge; electrons enter the cathode, which has a (+) charge.’
      • ‘The fuel cell also needs moisture in the electrolyte as well as water at the anode to control the supply of methanol.’


Mid 19th century: from Greek anodos ‘way up’, from ana ‘up’ + hodos ‘way’.