noun
also lu·te·cium lüˈtesh(ē)əm
( -s )
Etymology: lutetium from New Latin, from Latin Lutetia, town in Gaul (now Paris) + New Latin -ium; lutecium from New Latin, from French Lutèce (from Latin Lutetia ) + New Latin -ium
: a trivalent metallic element of the rare-earth group usually associated with ytterbium in the purification steps leading to its isolation — symbol Lu ; see element table