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Adjuvant

n.
  1. (Immunology) A substance added to an immunogenic agent to enhance the production of antibodies.
  2. A substance added to a formulation of a drug which enhances the effect of the active ingredient.

a.
  1. Helping; helpful; assisting.

n.
  1. An assistant.
  2. (Med.) An ingredient, in a prescription, which aids or modifies the action of the principal ingredient.