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Noun actinide series has 2 senses
  1. actinide series - a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
    --1 is a kind of     series
  2. actinide series - (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers
    --2 is a kind of     series
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