Most of us who have heard of it only know the bezoar as a tiny antidote stone from Harry Potter. Well, it's an actual thing! An intestinal blockage occurring in the stomachs of goats, and in special cases, humans, a bezoar was believed by alchemists in the Middle Ages to possess curative properties, which is definitely where J.K. Rowling got the idea from. Because of this, it (probably through French) comes from the Arabic word for "antidote", bazahr. This derives from Proto-Indo-European pad-zahr, literally "counter-poison", with pad meaning "against" or "counter" and zahr meaning "poison". The former is from Old Persian pa, which meant "protect" and comes from PIE peh, with the same meaning. The second is from Old Iranian jathra, which meant "to kill" (not that big of a transition), from PIE gwhen, "to strike" or still "kill". So a bezoar means "protecting [from a] kill", and J.K. Rowling knows her Middle Ages superstitions!
Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy philosophy, trivia, vexillology, geography, board games, conlanging, art history, and law.