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active citizen
actiniopteris
cento
actinometrical
actitis hypoleucos
pint
hallowe'en
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actinide series
actinide series
/ˈækˈtɪnˌaɪd ˈsɪəriz/
noun
(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
(
actinide series
)
(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
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