Source : Webster's Revised Unabridged Dictionary (1913)

Bouillon \Bou`illon"\, n. [F., fr. bouillir to boil.]
   1. A nutritious liquid food made by boiling beef, or other
      meat, in water; a clear soup or broth.

   2. (Far.) An excrescence on a horse's frush or frog.

Source : WordNet®

bouillon
     n : a clear seasoned broth