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Definition of astatine noun from the Oxford Advanced American Dictionary

 

astatine

 noun
noun
NAmE//ˈæstəˌtin//
 
[uncountable] (symbol At)
 
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a chemical element. Astatine is a radioactive element that is found in small amounts in nature, and is produced artificially for use in medicine.
See the Oxford Advanced Learner's Dictionary entry: astatine