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1. (n.) actinium
a radioactive, silver-white, metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence.
Etymology: (< F (1900); see actino -, -ium2)
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| Definition of 'actinium' |
Princeton's WordNet |
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1. (noun) actinium, Ac, atomic number 89
a radioactive element of the actinide series; found in uranium ores
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| Definition of 'actinium' |
Webster Dictionary |
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1. (noun) actinium
a supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light
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| Definition of 'actinium' |
U.S. National Library of Medicine |
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1. actinium
Actinium. A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, atomic number 89, and atomic weight 227.0278. Its principal isotope is 227 and decays primarily by beta-emission.
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Definitions of actinium 
