baking soda ba·king·soda uncommon noun 1. a white soluble compound (NaHCO3) used in effervescent drinks and in baking powders and as an antacid Synonymsbicarbonate of sodasodium hydrogen carbonatesodium bicarbonatebaking sodasaleratus Related words Broader terms bicarbonate WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
