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Imaging Lung opacification The opacification of one or both lungs on a plain AP film of the chest, which typically occurs in pneumonia, but may also be seen in heart failure
Substance abuse A generic term for commercial products used to correct typed or written errors on paper documents by painting over them with an opaque white, rapid-drying liquid
Vox populi A weather condition in which visibility and contrast are severely reduced by snow, with loss of a visual horizon and reference points, resulting in marked disorientation. It may be due to extremely heavy snowfall rate or other factors such as diffuse lighting from overcast clouds, mist or fog, or a background of snow
Wilderness medicine Sun glare An arctic condition characterised by loss of object visualisation caused by bright sunlight reflecting off snow, resulting in snow blindness