noun
(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
• Topics: ↑chemistry, ↑chemical science
• Hypernyms: ↑series
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noun : a series of heavy radioactive metallic elements of increasing atomic number considered to be analogous to the lanthanide series and to begin with actinium (89) or thorium (90) and end with element of atomic number 103 — compare actinium series, periodic table
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Chem.
the series of radioactive elements that starts with actinium and ends with lawrencium.
[1940-45]
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actinide series,
the actinides.
Useful english dictionary. 2012.