(1):
(n.) A substance added to an immunogenic agent to enhance the production of antibodies.
(2):
(a.) Helping; helpful; assisting.
(3):
(n.) An assistant.
(4):
(n.) A substance added to a formulation of a drug which enhances the effect of the active ingredient.
(5):
(n.) An ingredient, in a prescription, which aids or modifies the action of the principal ingredient.