pitchblende
noun
pitch·blende ˈpich-ˌblend 
: a brown to black mineral that consists of massive uraninite, has a distinctive luster, contains radium, and is the chief ore-mineral source of uranium
Word History
Etymology
partial translation of German Pechblende, from Pech pitch + Blende blende
First Known Use
1770, in the meaning defined above
Kids Definition
pitchblende
noun
pitch·blende ˈpich-ˌblend
: a dark mineral that is a source of radium and uranium
Medical Definition
pitchblende
noun
pitch·blende ˈpich-ˌblend
: a brown to black mineral that consists of massive uraninite, has a distinctive luster, contains radium, and is the chief ore-mineral source of uranium