Definition of fog

The word "fog" has its roots in Old English. The earliest recorded use of the word dates back to the 7th century, where it was written as "fogh" or "fogtreig". It is believed to have come from the Old English word "fogol", which referred to a mist or haze. The word "fog" gained more widespread use in the 14th century, and was often associated with poor weather and reduced visibility. By the 16th century, the word had taken on its modern meaning of a dense cloud of moisture suspended in the air near the ground. Over time, the word "fog" has evolved to encompass various forms of low-lying cloud, including radiation fog, advection fog, and steam fog. Despite its evolution, the word "fog" retains its core meaning of a misty or cloudy condition that reduces visibility.