substance added to something else to improve its qualities, such as a food additive, preservative, or pigment

a substance added to something else in small quantities to improve it or preserve it; an accretion

Chemical compounds added to gasoline to improve quality or solve engine issues, such as preventing corrosion, removing deposits, or providing lubrication

substance added to food to preserve flavor or enhance its taste and appearance

Chemical or natural substance added to food during production to improve color, flavor, nutrition, or shelf life