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A medicine for expelling phlegm; an expectorant.
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From Middle French fleumagogue, French †phlegmagogue, †flegmagogue and its etymon post-classical Latin phlegmagogum, use as noun of phlegmagogus carrying off phlegm from Hellenistic Greek ϕλεγμαγωγός from ancient Greek ϕλέγμα + ἀγωγός drawing forth.