bouillon UK /ˈbuː.jɒn/US /ˈbʊlˌjɑn/ noun3 •A clear seasoned broth made by simmering usually light meat, such as beef or chicken. •A similar broth made by reconstituting, that is, by adding hot water to dried powder concentrate; the dried powder concentrate itself. •An excrescence on a horse's frush or frog. formsbouillons