1. Noun.  A thing which aids or assists; an auxiliary.
  2. Noun.  One who helps or facilitates; an assistant.
  3. Noun.  (medicine) An additive (as in a drug) that aids or modifies the action of the principal ingredient.
  4. Noun.  (medicine) Something (as in a method) that enhances the effectiveness of a medical treatment.
  5. Noun.  (immunology) A substance enhancing the immune response to an antigen.
  6. Adjective.  The noun used as a modifier.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.