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

expectorant

noun
 
/ɪkˈspektərənt/
 
/ɪkˈspektərənt/
(medical)
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  1. a cough medicine that helps you to get rid of phlegm (= a thick substance) 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 expectorant in the Oxford Advanced American Dictionary
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