nipponium means A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- A chemical element, supposed to be the then-undiscovered technetium, but later identified as rhenium.“Element between molybdenum and ruthenium (perhaps Ogawa's nipponium)”