acetic acid ace·ti·ca·cid uncommon noun 1. a colorless pungent liquid widely used in manufacturing plastics and pharmaceuticals Synonymsacetic acidethanoic acid Related words Broader terms carboxylic acid Narrower terms acetumtrichloroacetic acidvinegar Parts diclofenac sodiumdiclofenac potassiumetodolacindomethacinketorolac tromethamineketorolac WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.