actinium

- See Also:
- - act
  - ACT
  - act of contrition
  - actant
  - ACTH
  - actin
  - acting pilot officer
  - actinian
  - actinic
  - actinide
  - actinium
  - actinolite
  - actinometer
  - actinomorphic
  - actinomycete
  - action
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  - action potential
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Concise Oxford English Dictionary © 2008 Oxford University Press:
actinium /akˈtɪnɪəm/

▶noun the chemical element of atomic number 89, a rare radioactive metallic element of the actinide series that occurs as an impurity in uranium ores. (Symbol: Ac)

– origin early 20th cent.: from Gk aktis, aktin- ‘ray’ + -ium.

'actinium' also found in these Oxford entries:

Ac - actinide - protactinium

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actinium