seaborgium
Concise Oxford English Dictionary © 2008 Oxford University Press:
seaborgium /siːˈbɔːgɪəm/
▶noun the chemical element of atomic number 106, a very unstable element made by high-energy atomic collisions. (Symbol: Sg)
– origin 1990s: mod. L., named after the American nuclear chemist Glenn Seaborg.
'seaborgium' also found in these Oxford entries:

