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transactinide element

[trans-ak-tuh-nahyd, tranz-]
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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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Origin of transactinide element

First recorded in 1965–70; trans- + actinide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018