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Từ điển WordNet v3.1 - WordNet Dictionary
pitchblende
a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium;
uraninite in massive form is called pitchblende which is the chief uranium ore
• Syn:
uraninite
• Hypernyms:
uranium ore
• Substance Meronyms:
uranium, U, atomic number 92
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