- noun a shiny metallic element used in strong magnets, carbon-arc lighting and laser materials
- A hard silver-white metallic chemical element whose atomic number is 62. It has about 30 known isotopes, of which 4 are stable. It is used in carbon arc lamps, as a dopant in lasers, as a neutron absorber, and it alloys with cobalt to form extremely powerful permanent magnets. Its chemical symbol is Sm.
- chemical symbol Sm
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