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Definition of actinium noun from the Oxford Advanced Learner's Dictionary

actinium

noun
 
/ækˈtɪniəm/
 
/ækˈtɪniəm/
[uncountable]
(symbol Ac)
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  1. a chemical element. Actinium is a radioactive metal.
    Word Originearly 20th cent.: from Greek aktis, aktin- ‘ray’ + -ium, used to form names of metallic elements.
See actinium in the Oxford Advanced American Dictionary
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Nearby words

halfway
adverb
 
 
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