Word: Actinium
Speech Type: Noun
Etymology:
early 20th century: from Greek aktis, aktin- ‘ray’ + -ium
Audio Pronunciation:
Phonetic Spelling:
akˈtɪnɪəm
Dialects: British English
Definition:
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.
Short Definition:chemical element of atomic number 89, radioactive metallic element of actinide series
Variant Forms:
- Ac
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