Definition of expectorant noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪkˈspektərənt//
; NAmE NAmE//ɪkˈspektərənt//
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a cough medicine that helps you to get rid of thick liquid (= phlegm) from the lungs Word Originmid 18th cent.: from Latin expectorant- ‘expelling from the chest’, from the verb expectorare, from ex- ‘out’ + pectus, pector- ‘breast’.
See the Oxford Advanced American Dictionary entry: expectorant