Source : Webster's Revised Unabridged Dictionary (1913)

Emmenagogue \Em*men"a*gogue\, n. [Gr. ?, n. pl., menses (? in +
   ? month) + ? leading, fr. ? to lead: cf. F. emm['e]nagogue.]
   (Med.)
   A medicine that promotes the menstrual discharge.

Source : WordNet®

emmenagogue
     n : any agent that promotes menstrual discharge