transactinide element

[trans-ak-tuh-nahyd, tranz-]
noun Chemistry, Physics.
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. See also transuranic element.

1965–70; trans- + actinide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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