by–product

something that naturally develops or is developed from something else hydrogen is one by-product of that chemical reaction Synonyms by-product, derivate, derivation, offshoot, outgrowth, spin-offRelated Words descendant (also descendent); aftermath, consequence, corollary, development, fruit, growth, issue, outcome, product, result, sequel, sequence, upshot; denouement (also dénouement), repercussion; aftereffect, side effect (also side reaction); copy, duplicate, facsimile, replica, reproductionNear Antonyms archetype, original, prototype; antecedent, cause, determinant, occasion, reasonAntonyms origin, root, source