1. [n]  confusion characterized by lack of clarity
2. [n]  droplets of water vapor suspended in the air near the ground
3. [n]  an atmosphere in which visibility is reduced because of a cloud of some substance
4. [v]  make less visible or unclear; "The stars are obscured by the clouds"

Fog
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1. \Fog\ (f[o^]g), n. [Cf. Scot. fog, fouge, moss, foggage rank
   grass, LL. fogagium, W. ffwg dry grass.] (Agric.)
   (a) A second growth of grass; aftergrass.
   (b) Dead or decaying grass remaining on land through the
       winter; -- called also {foggage}. [Prov.Eng.]
       --Halliwell.
   Note: Sometimes called, in New England, {old tore}. In
         Scotland, fog is a general name for moss.
   

2. \Fog\ v. t. (Agric.)
   To pasture cattle on the fog, or aftergrass, of; to eat off
   the fog from.
   

3. \Fog\ v. i. [Etymol. uncertain.]
   To practice in a small or mean way; to pettifog. [Obs.]
         Where wouldst thou fog to get a fee?     --Dryden.
   

4. \Fog\ n. [Dan. sneefog snow falling thick, drift of snow,
   driving snow, cf. Icel. fok spray, snowdrift, fj[=u]k
   snowstorm, fj[=u]ka to drift.]
   1. Watery vapor condensed in the lower part of the atmosphere
      and disturbing its transparency. It differs from cloud
      only in being near the ground, and from mist in not
      approaching so nearly to fine rain. See {Cloud}.
   2. A state of mental confusion.
   {Fog alarm}, {Fog bell}, {Fog horn}, etc., a bell, horn,
      whistle or other contrivance that sounds an alarm, often
      automatically, near places of danger where visible signals
      would be hidden in thick weather.
   {Fog bank}, a mass of fog resting upon the sea, and
      resembling distant land.
   {Fog ring}, a bank of fog arranged in a circular form, --
      often seen on the coast of Newfoundland.
   

5. \Fog\, v. t. [imp. & p. p. {Fogged}; p. pr. & vb. n.
   {Fogging}.]
   To envelop, as with fog; to befog; to overcast; to darken; to
   obscure.
   

6. \Fog\, v. i. (Photog.)
   To show indistinctly or become indistinct, as the picture on
   a negative sometimes does in the process of development.
   

7. \Fog\, n. (Photog.)
   Cloudiness or partial opacity of those parts of a developed
   film or a photograph which should be clear.
   

8. \Fog\, v. t. (Photog.)
   To render semiopaque or cloudy, as a negative film, by
   exposure to stray light, too long an exposure to the
   developer, etc.