A bezoar is a solid mass that forms in the digestive system, obstructing normal function. These masses typically consist of undigested or indigestible substances, such as hair, fibers, or medications.

In the first Harry Potter novel, Professor Severus Snape hopes to embarrass Harry by quizzing him on the topic of bezoars. According to Snape, they are stony masses found in the stomach of a goat that ...

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