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transactinide element

[trans-ak-tuh-nahyd, tranz-] /trænsˈæk təˌnaɪd, trænz-/
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.
Origin of transactinide element
1965-1970
1965-70; trans- + actinide
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for transactinide

transactinide

/ˌtrænsˈæktɪˌnaɪd/
noun
1.
any artificially produced element with an atomic number greater than 103
Word Origin
C20: from trans- + actinide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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