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roentgenium

[rent-gen-ee-uh m, -jen-, ruhnt-] /rɛntˈgɛn i əm, -ˈdʒɛn-, rʌnt-/
noun, Chemistry, Physics.
1.
a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111.
Formerly unununium, element 111.
Origin
named after German physicist Wilhelm Konrad Roentgen; see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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