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[fog, fawg] /fɒg, fɔg/
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
Related forms
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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Examples for fogging
  • For reducing the adult mosquito load, fogging with insecticide is somewhat effective.
British Dictionary definitions for fogging


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
a cloud of any substance in the atmosphere reducing visibility
a state of mental uncertainty or obscurity
(photog) a blurred or discoloured area on a developed negative, print, or transparency caused by the action of extraneous light, incorrect development, etc
a colloid or suspension consisting of liquid particles dispersed in a gas
verb fogs, fogging, fogged
to envelop or become enveloped with or as if with fog
to confuse or become confused to fog an issue
(photog) to produce fog on (a negative, print, or transparency) or (of a negative, print, or transparency) to be affected by fog
Word Origin
C16: perhaps back formation from foggy damp, boggy, from fog²


  1. a second growth of grass after the first mowing
  2. grass left to grow long in winter
Word Origin
C14: probably of Scandinavian origin; compare Norwegian fogg rank grass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fogging
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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fogging in Medicine

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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fogging in Science
  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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Slang definitions & phrases for fogging


  1. (also fog it) To run; speed; hurry (1914+ Western)
  2. To throw with great force: Ole Diz was in his prime then, fogging a fastball (1930s+ Baseball)
  3. To attack; shoot •Also recorded as 1920s racketeer talk: I takes me heat an' fogs 'em (1920s+ Western)
Related Terms

in a fog

[origin unknown; probably a substitution for smoke in all senses]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Related Abbreviations for fogging


  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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Idioms and Phrases with fogging
see: in a fog
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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