fog

Science Dictionary
fog   (fôg)  Pronunciation Key 
  1. A dense layer of cloud lying close to the surface of the ground or water and reducing visibility to less than 1 km (0.62 mi). Fog occurs when the air temperature becomes identical, or nearly identical, to the dew point.

  2. An opaque or semiopaque condensation of a substance floating in a region or forming on a surface.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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