Os

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals;
the heaviest metal known
• Syn:
osmium, atomic number 76
• Hypernyms:
metallic element, metal

• Từ đồng nghĩa / Synonyms:
  O, type O, group O, oxygen, atomic number 8