neptunium

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a radioactive transuranic metallic element;
found in trace amounts in uranium ores;
a by-product of the production of plutonium
• Syn:
Np, atomic number 93
• Hypernyms:
metallic element, metal

• Từ đồng nghĩa / Synonyms:
  Np, atomic number 93