Nipponium

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium. dated, uncountable
"Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)"

Example

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

Etymology

From Nippon + -ium. Doublet of nihonium.

Related phrases

chemical element

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.