antiacid

ANTIAC'ID, a. Opposing or removing acidity. Often written antacid.

ANTIAC'ID, n. An alkali; a medicine proper to correct sourness, or acidity; an absorbent, as chalk, magnesia, coral, sea shells, hematite, steel fillings; or an obtundent, as oil or fat; or an immutant, as lixivious salts, and soaps.