Any component that is added in the manufacture of a product.
Merriam-Webster Online Dictionary
ingredient (noun)something that enters into a compound or is a component part of any combination or mixture - constituent element
Merriam-Webster Online Thesaurus
ingredient (noun)one of the parts that make up a whole
SYNONYMS:
building block, component, constituent, factor, ingredient, memberRELATED WORDS:
basis, part and parcel; detail, item, particular, point; aspect, characteristic, facet, feature, trait; division, fragment, particle, partition, piece, portion, section, sector, segment; subcomponentNEAR ANTONYMS:
aggregate, composite, compound, mass; entirety, sum, summation, total, totality; admixture, amalgam, amalgamation, blend, combination, intermixture, mix, mixturePart, piece, unit, section, segment, ingredient, factor, module, part, piece, unit, section, segment, ingredient, factor, module, part, piece, unit, section, segment, ingredient, factor, module, supplement, enhancer, fortifier, ingredient, compound, material, matter, element, ingredient, material, matter