Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun astatine

1 sense of astatine

Sense 1
astatine, At, atomic number 85 -- (a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium)
       => 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)