roentgenium
[rent-gen-ee-uh m, -jen-, ruhnt-]
- a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111.
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Origin of roentgenium
Formerly unununium, element 111.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018