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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.