WordReference Random House Unabridged Dictionary of American English © 2026
actin′ium se′ries, [Chem.]
  1. Chemistrythe radioactive series that starts with uranium 235 and ends with a stable isotope of lead of mass number 207.
  • 1955–60

'actinium series' also found in these entries (note: many are not synonyms or translations):
actinon - nobelium

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