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actinium
Definitions
[akˈtɪnɪəm], (Noun)
Definitions:
- the chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores
Phrases:
Origin
:
early 20th century: via French from Greek aktis, aktin- ‘ray’ + -ium
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definition by Oxford Dictionaries