[1] : The Collaborative International Dictionary of English v.0.48

fog \fog\ fo^g, n. dan. sneefog snow falling thick, drift
   of snow, driving snow, cf. icel. fok spray, snowdrift,
   fj=uk snowstorm, fj=uka 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.
      1913 webster

   2. a state of mental confusion.
      1913 webster

   3. photog. cloudiness or partial opacity of those parts of
      a developed film or a photograph which should be clear.
      webster 1913 suppl.

   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.
      1913 webster
see also:
cloud fog alarm fog bell fog horn fog bank fog ring 

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