roentgenium

[ rent-gen-ee-uhm, -jen-, ruhnt- ]

noun

, Chemistry, Physics.

1. a superheavy, synthetic radioactive element with a very short half-life. : Rg; : 111.

roentgenium

/ rĕnt-gĕn′ē-əm,-jĕn′-,rŭnt-,rœnt-gĕn′- /

1. An artificially produced radioactive element with a mass number of 280. Its most stable known isotope has a half-life of 3.6 seconds. Atomic number 111.
2. See Periodic Table

Word History and Origins

Origin of roentgenium¹

First recorded in 2000–05; named after German physicist Wilhelm Konrad Roentgen.