emmenagoguePronunciation: /ɪˈmiːnəgɒg, ɛ-/Definition of emmenagogue noun Medicine a substance that stimulates or increases menstrual flow. Origin: early 18th century: from Greek emmēna 'menses' + agōgos 'eliciting'emmenagogue in other Oxford dictionaries Definition of emmenagogue in the US English dictionary