/ Thesaurus / P Synonyms of potassium hydrogen carbonate Find synonyms for: Noun1. potassium bicarbonate, potassium acid carbonate, potassium hydrogen carbonate, bicarbonate, hydrogen carbonateusage: a crystalline salt (KHCO3) that is used in baking powder and as an antacidWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language