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actinide series

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noun Chemistry.
  1. the series of radioactive elements that starts with actinium and ends with lawrencium.

Origin of actinide series

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for actinide series

actinide series

noun
  1. a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012