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1. a colloid system in which the dispersion medium is a gas and the dispersed particles are liquid.
2. an artifact seen on a radiograph caused by unintentional exposure to reducing contrast.


(fog) a colloid system in which the dispersion medium is a gas and the disperse particles are liquid.


Droplets dispersed in the atmosphere or a respiratory device.


Abbreviation for freezing of gait.

light fog

(līt fawg)
Black areas seen on a radiograph when a film is exposed to white light before processing.
Synonym(s): fog.

fog (fogging),

fog, chemical,
n See film fault.
fog, dyschroic,
fog, light,
n See film fault.
fog, radiation,
n the film darkening caused by radiation from sources other than intentional exposure to the primary beam; e.g., film may be exposed to scatter radiation, or accidental exposure may occur if stored film is not protected from radiation.


1. a colloid system in which the dispersion medium is a gas and the dispersed particles are liquid.
2. regrowth after harvesting of a cereal crop. Called also aftermath, feg.
3. obscuring opacity on an x-ray film.

basic fog
blackening of an unexposed x-ray film after development.
x-ray fog
local or general exposure to extraneous radiation, light or chemical action which is additional to the true photographic image. Leads to spoiling of the x-ray image.

Patient discussion about fog

Q. In what way the brain fog symptom associated with fibromyalgia? In what way the brain fog symptom associated with fibromyalgia? What are the other symptoms of fibromyalgia?

A. memory loss is also associated with Fibromyalgia...lack of concentration and you just feel like you are in a fog...can't remember....can't think. Our standing joke at my house is "I am in the "fog" today. The one thing my doctor ALWAYS reminds me of fibro affects people differently, remember you may not have all the sympoms or you may have ones others don't but fibromyalgia is widespread pain that has lasted 3 months or more, it is pain of the fibrous tissue - ligiments, tendons and muscles. You feel stiff and achy all over. There are trigger points such as neck, shoulders, spine and hips. Chronic fatigue taht is possibly related to the disturbed sleep patterns. Most suffers I have talked to have restless leg syndrome and headaches. Irritable bowl is associated but on that one I am lucky I haven't had the problem but have had swolling problems and vision problems...I hope this helps. Good Luck!

More discussions about fog
References in periodicals archive ?
The aim of such an innovative proposal, which was devised by the Operations Department at the Directorate General of Central Operations, is to provide an optimal warning for drivers within seconds of a traffic accident a few kilometers ahead of them on external roads, to avoid eventual surprises in foggy weather," he stated.
Department for Transport stats support these fears as more than 750 incidents were recorded during snowy and foggy weather.
Obviously, it is sensible to restrict or stop travel, like plane flights, in foggy weather.
Birmingham International Airport has announced that on Friday (22 December) it is continuing to operate with the minimum of delays and cancellations despite the foggy weather conditions being experienced in the UK.
San Francisco International Airport could solve its flight-delay problems by having planes start their landings at a runway's midpoint during foggy weather, the San Francisco Chronicle's Stanford M.
Five dollars buys you a tour of the 5,000-square-foot demonstration bakery and a visit to a museum of San Francisco history, where bakers will explain how the city's foggy weather has kept the sourdough starter alive and well since 1849.
In wet or foggy weather that time should be increased to four seconds.
After moist, foggy weather cooled the region Thursday, a high-pressure system moved over Nevada and Utah, he said.
For mood and emphasis, there is nothing quite like foggy weather.
Travelling in Foggy Weather is Like Driving Blindfolded
The Abu Dhabi Police have stepped up efforts to enforce the traffic law banning trucks and buses transporting labourers from using the roads during foggy weather.
Summary: 22 people were injured in the pileup in foggy weather on Tuesday