noun
(a) chemical compound containing hydrogen, which reacts with an alkali to form a salt and water; hydrochloric acid is secreted in the stomach and forms part of the gastric juices
bile acids = acids (such as cholic acid) found in the bile
inorganic acids = acids which come from minerals, used in dilute form to help indigestion
organic acids = acids which come from plants, taken to stimulate the production of urine
(b) any bitter juice