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anode

used in a sentence
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Definition a positively charged electrode by which electrons leave an electrical device

or:

the negatively charged terminal of a voltaic cell or storage battery that supplies current
  • Metal can be protected from corrosion by placing it in contact with a more easily corroded metal. The metal to be protected will act as a cathode and the more easily corroded metal will act as an anode.
  • ...was a urologist for his urine, a lymphologist for his lymph, an endocrinologist for his endocrines, a psychologist for his psyche, a dermatologist for his derma; there was a pathologist for his pathos, a cystologist for his cysts, and a bald and pedantic cetologist from the zoology department at Harvard who had been shanghaied ruthlessly into the Medical Corps by a faulty anode in an I.B.M. machine and spent his sessions with the dying colonel trying to discuss Moby Dick with him.
    Joseph Heller  --  Catch-22

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