trans·​ac·​ti·​nide tran(t)-ˈsak-tə-ˌnīd How to pronounce transactinide (audio)
: of, relating to, or being actual or hypothetical elements with atomic weights higher than those of the actinide series
transactinide chemistry

Word History

First Known Use

1969, in the meaning defined above

Time Traveler
The first known use of transactinide was in 1969

Dictionary Entries Near transactinide

Cite this Entry

“Transactinide.” Dictionary, Merriam-Webster, Accessed 14 Jun. 2024.

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