thorium

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a soft silvery-white tetravalent radioactive metallic element;
isotope 232 is used as a power source in nuclear reactors;
occurs in thorite and in monazite sands
• Syn:
Th, atomic number 90
• Derivationally related forms:
thoriate
• Hypernyms:
metallic element, metal
• Hyponyms:
thorium-228, radiothorium
• Substance Holonyms:
monazite, thorite

• Từ đồng nghĩa / Synonyms:
  Th, atomic number 90