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1 Definition: The anode of a device is the terminal where current flows in from outside. The cathode of a device is the terminal where current flows out. This is illustrated in figure 1.  A useful mnemonic is ACID : Anode Current Into Device.
Re: anode vs cathode??? OK so the terms anode and cathode are used to describe the function of the electrode. What they are saying on wikipedia means that the function of the electrode changes when the type of cell is changed.