/ Thesaurus / S Synonyms of seat belt Find synonyms for: Noun1. seat belt, seatbelt, safety belt, life belt, safety harnessusage: a safety belt used in a car or plane to hold you in your seat in case of an accidentWordNet 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