lutetium

noun

a soft, silvery-white chemical element, one of the rare-earth elements and the last member of the lanthanide series: symbol, Lu; at. no., 71

Etymology: ModL < lutetia, lutetium oxide (< L Lutetia: see Lutetia) + -ium: so named by G. Urbain (1872-1938), Fr chemist, after his native city