/ Thesaurus / A Synonyms of actinide series Find synonyms for: Noun1. actinide series, seriesusage: (chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrenciumWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language