The Collaborative International Dictionary
Cholagogue \Chol"a*gogue\, a. [Gr. ?; ? bile + ? leading, ? to lead: cf. F. cholagogue.] (Med.) Promoting the discharge of bile from the system. -- n. An agent which promotes the discharge of bile from the system.
Wiktionary
alt. (context obsolete medicine English) Any agent that promotes the discharge of bile. n. (context obsolete medicine English) Any agent that promotes the discharge of bile.
Wikipedia
A cholagogue is a medicinal agent which promotes the discharge of bile from the system, purging it downward.
In Patrick O'Brian's Post Captain (Ch. 10), which is set in the Napoleonic era, Stephen Maturin, one of the book's main characters (who is also a physician, naturalist and spy) sits in the snug of the Rose and Crown in Deal, Kent, and drinks a "good" tea described as an "unrivalled cholagogue".
Cyclovalone is a choleretic and cholagogic agent.
Usage examples of "cholagogue".
Physic, Black-root, Tall Speedwell, and Indian Physic, is a certain cholagogue, laxative, and cathartic.
He lived in Richmond, and, to keep him free from fever-and-ague, my brother dosed him freely with cholagogue whenever he came down into the malarial country.
He would naturally think twice before he gave an emetic or cathartic which evacuated his own pocket, and be sparing of the cholagogues that emptied the biliary ducts of his own wallet, unless he were sure they were needed.