iridium

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a heavy brittle metallic element of the platinum group;
used in alloys;
occurs in natural alloys with platinum or osmium
• Syn:
Ir, atomic number 77
• Hypernyms:
metallic element, metal

• Từ đồng nghĩa / Synonyms:
  Ir, atomic number 77