nipponium

N1I1P3P3O1N1I1U1M3

noun

A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium.

Scrabble 15
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Meanings

nounnipponium (uncountable)
  1. dateduncountableA chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium.

    Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)

    1923, Ulick R. Evans, Metals and metallic compounds, page 362
    1 more example

    Tiede at Berlin University told Toshiyuki Majima that nipponium might be rhenium when the latter visited him in 1938.

    2008, Proceedings of the Japan Academy: physical and biological sciences, volume 84, page 237

Origin

From Nippon + -ium. Doublet of nihonium.

Full word history & related roots →
Cite this entry
APA

nipponium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/nipponium

MLA

“nipponium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/nipponium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “nipponium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/nipponium.

Source: nipponium on Wiktionary, CC BY-SA 4.0.