pitchblende


Concise Oxford English Dictionary © 2008 Oxford University Press:
pitchblende /ˈpɪtʃblɛnd/
noun a form of the mineral uraninite occurring in brown or black pitch-like masses and containing radium.
– origin C18: from Ger. Pechblende, from Pech ‘pitch’ + Blende (see blende).
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