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Medical Definition of Actinide elements
1. Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. Synonym: actinide elements. Origin: actinium, first element of the series (05 Mar 2000)
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1. Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. Synonym: actinide elements. Origin: actinium, first element of the series (05 Mar 2000)