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transactinide element

[ trans-ak-tuh-nahyd, tranz- ]

noun

, Chemistry, Physics.
  1. any element having an atomic number higher than 103, the last of the actinide series. These superheavy, radioactive elements are extremely short-lived, and can only be created in the laboratory.


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Word History and Origins

Origin of transactinide element1

First recorded in 1965–70; trans- + actinide

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