The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 2. (Far.) An excrescence on a horse's frush or frog. [1913 Webster]WordNet (r) 3.0 (2006):
bouillon n 1: a clear seasoned broth