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astatine.

A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.

8 characters3 syllables approx.English language

Meaning & usage

noun/ˈastətiːn/UK/ˈæstəˌtin/US
  1. A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.

    countable · uncountable
  2. A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85. An atom of this element.

    countable
Where this word comes from

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

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.