The Collaborative International Dictionary of English v.0.48:
mouthwash \mouthwash\ n. a medicated solution used for gargling and rinsing the mouth. Syn: gargle. [WordNet 1.5]WordNet (r) 3.0 (2006):
mouthwash n 1: a medicated solution used for gargling and rinsing the mouth [syn: gargle, mouthwash]