Definition of astatine noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈæstətiːn//
; NAmE NAmE//ˈæstətiːn//
[uncountable] (symbol At)
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a chemical element. Astatine is a radioactive element which is found in small amounts in nature, and is produced artificially for use in medicine. Word Origin 1940s: from Greek astatos ‘unstable’ + -ine.
See the Oxford Advanced American Dictionary entry: astatine