The Collaborative International Dictionary
Lithagogue
Lithagogue \Lith"a*gogue\ (l[i^]th"[.a]*g[o^]g), n. [Gr. li`qos
stone + 'agwgo`s leading.] (Med.)
A medicine having, or supposed to have, the power of
expelling calculous matter with the urine.
--Hooper.
Wiktionary
lithagogue
n. (context medicine archaic English) Any medicine capable of expelling calculous matter with the urine.