uranium

2 ENTRIES FOUND:

ura·ni·um

noun \y-ˈrā-nē-əm\

Definition of URANIUM

: a silvery heavy radioactive polyvalent metallic element that is found especially in pitchblende and uraninite and exists naturally as a mixture of three isotopes of mass number 234, 235, and 238 in the proportions of 0.006 percent, 0.71 percent, and 99.28 percent respectively—symbol U; see element table

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