Definition of: fog

(fog, fôg) noun Agric.
1. Dead or decaying grass.
2. Aftermath (def. 2). Also foggage. [ME fogge, prob. <Scand. Cf. Norw. fogg long grass on wet ground.]
—fog′gy adjective

fog² (fog, fôg) noun
1. Condensed watery vapor suspended in the atmosphere at or near the earth's surface.
2. Chem. A colloid system of the liquid–in–gas type (see COLLOID SYSTEM).
3. Meteorol. Any hazy condition of the atmosphere, or he material causing it: a dust fog.
4. Bewilderment; obscurity.
5. Phot. A coating obscuring a developed photographic plate.
—v. fogged, fog·ging v.t.
1. To surround with or as with fog.
2. To confuse; bewilder.
3. Phot. To cloud (a plate) with a fog.
—v.i.
4. To become foggy. [Prob. back formation <foggy, in the sense “marshy” <FOG¹; infl. in meaning by Dan. fog spray]

Fo·gaz·za·ro (fō′gät·tsä′rō), Antonio,
1842–1911, Italian novelist and poet.

fog bank
A mass of fog seen at a distance, especially at sea.

fog·bound (fog′bound′, fôg′-) adjective
Detained by fog; prevented because of fog from traveling, sailing, flying, etc.

fog·bow (fog′bō′, fôg′-) noun Meteorol.
A white or very faintly colored arc of light seen opposite the sun in fog.

fog chamber
A cloud chamber. See under CHAMBER.

fog dog
A clearing spot in a fog bank, indicating the lifting of the fog: also called sea dog.

fog·fruit (fog′frt′, fôg′-) noun
An American creeping plant (genus Lippia) of the vervain family bearing closely bracted heads of bluish–white flowers, especially L. lanceolata.

fog·gage (fog′ij, fôg′-) noun
1. Long grass, left standing over winter, for feeding cattle in the spring.
2. The privilege of pasturing cattle on fog; also, such pasturing.