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1. (n.) astatine
a rare element of the halogen family.
Etymology: (1945–50; < Gk ástat(os) unstable + -ine2)
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| Definition of 'astatine' |
Princeton's WordNet |
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1. (noun) astatine, At, atomic number 85
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
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| Definition of 'astatine' |
U.S. National Library of Medicine |
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1. astatine
Astatine. A radioactive halogen with the atomic symbol At, atomic number 85, and atomic weight 210. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism.
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Definitions of astatine 
