astatine

Noun
  1. A highly unstable radioactive element (the heaviest of the halogen series);
    A decay product of uranium and thorium (synset 114653739)
    is a type of:
    • chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    • halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
    same as: at, atomic number 85

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