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From Ancient Greek δυσπρόσιτος (dusprósitos, “hard to get”) + -ium. Compare also unobtainium.
Etymology from Wiktionary, CC BY-SA 4.0.
dysprosium
Today it means: A metallic chemical element (symbol Dy) with atomic number 66: a rare earth element with a metallic silver lustre. Applications in human affairs include magnets with high performance, which are important in various machines with electric motors. Full definition →