Sm

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a grey lustrous metallic element of the rare earth group;
is used in special alloys;
occurs in monazite and bastnasite
• Syn:
samarium, atomic number 62
• Hypernyms:
metallic element, metal
• Substance Holonyms:
bastnasite, bastnaesite, monazite