1. a rare metallic chemical element of the lanthanide series with the symbol Lu and atomic number 71
Usage: chemistry; also spelled lutetium

Examples

• Lutecium is the last element in the lanthanide series.
• The scientist studied the properties of lutecium in the laboratory.
• Lutecium is one of the rarest and most expensive rare earth elements.
• The atomic number of lutecium is 71.
• Lutecium has very limited commercial applications due to its scarcity.
• The element lutecium was discovered in 1907.