roentgenium

noun
roent·gen·i·um | \ rent-ˈge-nē-əm , rənt- , -ˈje- \

Definition of roentgenium 

: a short-lived radioactive element produced artificially — see Chemical Elements Table

First Known Use of roentgenium

2004, in the meaning defined above

History and Etymology for roentgenium

New Latin; from the fact that the element was synthesized on the centennial of Röntgen's discovery of X-rays

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The first known use of roentgenium was in 2004

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