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Definition of Actinide
1. Noun. Any of a series of radioactive elements with atomic numbers 89 through 103.
Definition of Actinide
1. any of a series of radioactive elements [n -S]
Medical Definition of Actinide
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1. Noun. Any of a series of radioactive elements with atomic numbers 89 through 103.
1. any of a series of radioactive elements [n -S]
1.