acid (lăkʹtĭk ăsʹĭd) noun. A syrupy, water-soluble liquid, C3H6O3, produced as a result of anaerobic glucose metabolism and present in sour milk, molasses, various fruits, and wines. A synthetic form of the compound is used in foods and beverages as a flavoring and preservative, in dyeing and textile printing, and in pharmaceuticals, asid laktik.
lactic (lăkʹtĭk) adjective. Of, relating to, or derived from milk, laktik.