Etymology
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expectorant (n.)

in medicine, "a drug which promotes or facilitates phlegm or other such matter from the body by means of expectoration," 1782, from Latin expectorantem (nominative expectorans), present participle of expectorare (see expectorate). From 1811 as an adjective.

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Definitions of expectorant

expectorant (n.)
a medicine promoting expectoration;
Synonyms: expectorator
From wordnet.princeton.edu