the series of radioactive elements that starts with actinium and ends with lawrencium.
Words nearby actinide series
Origin of actinide series
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for actinide series
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