/ Thesaurus / A Synonyms of alka seltzer Find synonyms for: Noun1. Alka-seltzer, antacid, gastric antacid, alkalizer, alkaliser, antiacidusage: a commercial antacid that contains aspirin; tablets dissolve in water to give an effervescent solutionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: torrid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language