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
Origin of lutetiumModern Latin ; from lutetia, lutetium oxide (; from Classical Latin Lutetia: see Lutetia) + -ium: so named by G. Urbain (1872-1938), French chemist, after his native city
A silvery-white rare-earth element that is exceptionally difficult to separate from the other rare-earth elements, used in nuclear technology. Atomic number 71; atomic weight 174.97; melting point 1,663°C; boiling point 3,402°C; specific gravity 9.841 (at 25°C); valence 3. See Periodic Table.
Origin of lutetiumLatin Lutetia, ancient name of Paris, France (where it was discovered) + –ium.
- A metallic chemical element (symbol Lu) with an atomic number of 71.