actinide series
ac·ti·ni·deseries
noun
1.
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
2.
(chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers
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Broader terms
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.