adjuvant (
http://definr.com/adjuvant)
adj 1: relating to something that is added but is not essential;
"an ancillary pump"; "an adjuvant discipline to forms
of mysticism"; "The mind and emotions are auxilliary
to each other" [syn:
accessory,
adjunct,
ancillary,
appurtenant,
auxiliary,
subsidiary]
2: (pharmacology) enhancing the action of a medical treatment;
"the adjuvant action of certain bacteria"
n : an additive that enhances the effectiveness of medical
treatment