adjuvant - a substance added to a vaccine to improve the immune response so that less vaccine is needed to produce a nonspecific stimulator (for example, BCG vaccine) of the immune response, adjuvant - a substance that, when added to a medicine, speeds or improves its action which aids another, such as an auxiliary remedy, adjuvant - aine, mis tugevdab teise aine toimet, eriti selle poolt esilekutsutud immuunvastust