…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.
There are no more uses of "anode" in the book.
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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.