lanthanum

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a white soft metallic element that tarnishes readily;
occurs in rare earth minerals and is usually classified as a rare earth
• Syn:
La, atomic number 57
• Hypernyms:
metallic element, metal

• Từ đồng nghĩa / Synonyms:
  La, atomic number 57