actinium
noun
\
Definition of actinium
: a radioactive trivalent metallic element that resembles lanthanum in chemical properties and that is found especially in pitchblende — see Chemical Elements Table
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More Definitions for actinium
actinium
noun
\
Medical Definition of actinium
: a radioactive trivalent metallic element that resembles lanthanum in chemical properties and that is found especially in pitchblende —symbol Ac — see Chemical Elements Table
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