mist,suspension in the atmosphere of very tinywater droplets (50–500 microns in diameter) or wet hygroscopic particles that reduces horizontal visibility to 1 km (0.6 mile) or more; if the visibility is reduced below 1 km, the suspension is called afog. Mist appears to cover the landscape with a thin, grayish veil. In theUnited States the term mist is sometimes used loosely to designate adrizzle, a very lightprecipitation composed of small water droplets (200–500 microns in diameter) falling to the ground. In Scotland and parts of England, a combination of thick mist or fog and heavy drizzle is calledScotch mist.