Etymology
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mouthwash (n.)

also mouth-wash, "therapeutic wash for the mouth," 1801, from mouth (n.) + wash (n.).

updated on March 24, 2019

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Definitions of mouthwash from WordNet

mouthwash (n.)
a medicated solution used for gargling and rinsing the mouth;
Synonyms: gargle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.