Adjuvant /(ăd"jū̇*vant)/

Ad·ju·vant

Adjuvant

a.
  1. Helping; helpful; assisting. [R.]

Adjuvant

n.
  1. An assistant. [R.]
  2. An ingredient in a prescription drug, which aids or modifies the action of the principal ingredient. (Med.)
  3. A substance that non-specifically enhances immune response to an antigen, such as by enhancing the production of antibodies. (Med., Immunology)