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.

Origin:
1965–70; trans- + actinide

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World English Dictionary
transactinide (ˌtrænsˈæktɪˌnaɪd)
 
n
any artificially produced element with an atomic number greater than 103
 
[C20: from trans- + actinide]

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Example sentences
Liquid-liquid extraction chemistry has proved successful in overcoming the difficulties presented by transactinide research.
We will also have minimal discussion of compounds of the transactinide elements in this chapter.
Summary of the reactions and methods used in the discovery of the actinide and transactinide elements.
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