actinide series

noun, Chemistry
1.
the series of radioactive elements that starts with actinium and ends with lawrencium.
Origin
1940-45
Examples from the web for actinide series
  • The actinide series derives its name from the first element in the series, actinium.
  • Systematic view of optical absorption spectra in the actinide series loading.
British Dictionary definitions for actinide series

actinide series

noun
1.
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium