/ Thesaurus / A Synonyms of alpha particle Find synonyms for: Noun1. alpha particle, particle, subatomic particleusage: a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language