nipponium en · NOUN
Etymology
From Nippon + -ium. Doublet of nihonium.
Meanings
-
(dated, uncountable) A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium.
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:Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)
1923, Ulick R. Evans, Metals and metallic compounds, page 362: