Etymology
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pitchblende (n.)

also pitch-blende, oxide of uranium, usually occurring in pitchy black masses, 1770, a loan-translation of German Pechblende; see pitch (n.2) + blende.

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Definitions of pitchblende

pitchblende (n.)
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;
Synonyms: uraninite
From wordnet.princeton.edu