/ Thesaurus / R Synonyms of radioactive dust Find synonyms for: Noun1. fallout, radioactive dust, dustusage: the radioactive particles that settle to the ground after a nuclear explosionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language