Source:http://linkedlifedata.com/resource/umls/id/C1522673
HL7V3.0: <p>A component (player) added to enhance the action of an active ingredient (scoper) (in the manner of a catalyst) but which has no active effect in and of itself. Such ingredients are significant in defining equivalence of products in a way that inactive ingredients are not.</p>,NCI: Serving to aid or contribute; auxiliary. (Merriam-Webster OnLine)