9 letters · 20 points in Scrabble
noun a medicated solution used for gargling and rinsing the mouth
originEtymology tree English mouth Proto-Indo-European *wed- Proto-Indo-European *-sḱéti Proto-Indo-European *wodsḱéti Proto-Germanic *waskaną Proto-West Germanic *waskan Old English wascan Middle English wasshen English wash English mouthwash From mouth + wash.
Etymology from Wiktionary, CC BY-SA 3.0