astatine

From Ancient Greek ἄστατος (ástatos, “unstable”) +‎ -ine.

• (UK) enPR: asʹtətēn, IPA^(key): /ˈastətiːn/
• (US) enPR: ăs'tətēn, IPA^(key): /ˈæstəˌtin/

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astatine (countable and uncountable, plural astatines)

1. A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.
   • 2003, Bill Bryson, A Short History of Nearly Everything, BCA, p. 221:

     Astatine, for instance, is practically unstudied. It has a name and a place on the periodic table (next to Marie Curie's polonium), but almost nothing else.

• alabamine (proposed name)
• anglo-helvetium (formerly)

• astatane
• eka-astatine

• Tánaiste, in a state, sanitate