First Known Use: 1900
Dictionary
actinium
noun ac·tin·i·um \ak-ˈti-nē-əm\
Definition of ACTINIUM
: a radioactive trivalent metallic element that resembles lanthanum in chemical properties and that is found especially in pitchblende — see element table
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Origin of ACTINIUM
New Latin
Medical Dictionary
actinium
noun ac·tin·i·um \ak-ˈtin-ē-əm\
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 element table
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