antagonist

  1. Noun.  An opponent or enemy.
  2. Noun.  One who antagonizes or stirs.
  3. Noun.  (biochemistry) A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
  4. Noun.  The main character or force opposing the protagonist in a literary work or drama.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license.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.