ad·ju·vant
(ăjə-vənt)
(ăjə-vənt)n.
1. A treatment that enhances an existing medical regimen, as a pharmacological agent added to a drug to increase or aid its effect.
2. An immunological agent that increases the antigenic response.
adj.
Contributing to or enhancing an existing medical regimen: adjuvant chemotherapy
[From Latin adiuvāns, adiuvant-, present participle of adiuvāre, to help; see AID.]