transactinide

adjective
trans·ac·ti·nide | \tran(t)-ˈsak-tə-ˌnīd, tran-ˈzak-\

Definition of transactinide 

: of, relating to, or being actual or hypothetical elements with atomic weights higher than those of the actinide series transactinide chemistry

First Known Use of transactinide

1969, in the meaning defined above

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The first known use of transactinide was in 1969

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