/ Thesaurus / B Synonyms of beta decay Find synonyms for: Noun1. beta decay, decay, radioactive decay, disintegrationusage: radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particleWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language