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1. (n.) uraninite
a radioactive mineral, uranium dioxide, UO
Etymology: (1875–80; uran (ium ) + -in1+ -ite1)
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| Definition of 'uraninite' |
Princeton's WordNet |
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1. (noun) uraninite, 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
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| Definition of 'uraninite' |
Webster Dictionary |
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1. (noun) uraninite
a mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende
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Definitions of uraninite 
