From Ancient Greek ἄστατος (ástatos, “unstable”) + -ine.
astatine (countable and uncountable, plural astatines)
- 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.