/ Thesaurus / G Synonyms of gastric antacid Find synonyms for: Noun1. antacid, gastric antacid, alkalizer, alkaliser, antiacid, agentusage: an agent that counteracts or neutralizes acidity (especially in the stomach)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language