SINCE 1828
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 Chemical Elements Table
Keep scrolling for more
Keep scrolling for more
More Definitions for actinium
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 Chemical Elements Table
Comments on actinium
What made you want to look up actinium? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
What did you just call me?! A Quiz
-
- If a member of the audience describes your speech as bombastic, does that person mean it is:
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZ
Share actinium
Resources for actinium