actinium

3 ENTRIES FOUND:

ac·tin·i·um

noun \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

Origin of ACTINIUM

New Latin
First Known Use: 1900

ac·tin·i·um

noun \ak-ˈtin-ē-əm\   (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 element table

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