Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: astatine  'as-tu,teen
  1. A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
    - At, atomic number 85

Derived forms: astatines

Type of: chemical element, element, halogen

Encyclopedia: Astatine