1 [fog, fawg]
a cloudlike mass or layer of minute water droplets or ice crystals near the surface of the earth, appreciably reducing visibility. Compare ice fog, mist, smog.
any darkened state of the atmosphere, or the diffused substance that causes it.
a state of mental confusion or unawareness; daze; stupor: The survivors were in a fog for days after the catastrophe.
Photography. a hazy effect on a developed negative or positive, caused by light other than that forming the image, by improper handling during development, or by the use of excessively old film.
Physical Chemistry. a mixture consisting of liquid particles dispersed in a gaseous medium.
verb (used with object), fogged, fogging.
to cover or envelop with or as if with fog: The steam in the room fogged his glasses.
to confuse or obscure: The debate did little else but fog the issue.
to bewilder or perplex: to fog the mind.
Photography. to produce fog on (a negative or positive).
verb (used without object), fogged, fogging.
to become enveloped or obscured with or as if with fog.
Photography. (of a negative or positive) to become affected by fog.

1535–45; perhaps by back formation from foggy. See fog2

fogless, adjective
unfogged, adjective
unfogging, adjective

3. obfuscation. See cloud. 7. becloud, obfuscate, dim, blur, darken. 8. daze, befuddle, muddle, mystify.

3. clarity. 7. clarify. 10. clear. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fog1 (fɒɡ)
1.  a mass of droplets of condensed water vapour suspended in the air, often greatly reducing visibility, corresponding to a cloud but at a lower level
2.  a cloud of any substance in the atmosphere reducing visibility
3.  a state of mental uncertainty or obscurity
4.  photog a blurred or discoloured area on a developed negative, print, or transparency caused by the action of extraneous light, incorrect development, etc
5.  a colloid or suspension consisting of liquid particles dispersed in a gas
vb , fogs, fogging, fogged
6.  to envelop or become enveloped with or as if with fog
7.  to confuse or become confused: to fog an issue
8.  photog to produce fog on (a negative, print, or transparency) or (of a negative, print, or transparency) to be affected by fog
[C16: perhaps back formation from foggy damp, boggy, from fog²]

fog2 (fɒɡ)
a.  a second growth of grass after the first mowing
 b.  grass left to grow long in winter
[C14: probably of Scandinavian origin; compare Norwegian fogg rank grass]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1540s, from Dan. fog "spray, shower, snowdrift," related to O.N. fok "snow flurry." The word meaning "long grass" (c.1300) may be a different word, but the two may connect via a notion of long grass growing in moist dells of northern Europe. Phrase in a fog "at a loss what to do" first recorded c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fogging fog·ging (fŏg'ĭng)
A method of refracting the eye in which accommodation is relaxed by overcorrection with a convex spherical lens, used in testing vision.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
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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American Heritage
Abbreviations & Acronyms
  1. fiber optic gyro

  2. father of the groom

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for fogging
For reducing the adult mosquito load, fogging with insecticide is somewhat effective.
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