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astatine

noun
🔊/ˈæstətiːn/
🔊/ˈæstətiːn/
[uncountable]
(symbol At)
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  1. a chemical element. Astatine is a radioactive element that is found in small amounts in nature, and is produced artificially for use in medicine.砹（放射性化学元素）
    Word Origin1940s: from Greek astatos ‘unstable’ + -ine.