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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Medical Dictionary
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
Learn More about actinium
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Britannica.com: Encyclopedia article about actinium
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