2016, in the meaning defined above
Japanese nihon "Japan" + -ium; so named because the element was produced at the RIKEN Nishina Center for Accelerator-Based Science in Wakō, Japan
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Cite this Entry
“Nihonium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nihonium. Accessed 1 Aug. 2021.
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