Fog

Fog is a noun referring to a thick cloud that forms close to the ground, reducing visibility and creating an atmosphere of obscurity and haziness. It occurs when water droplets or ice crystals are suspended in the air near the surface, often resulting from the cooling of moist air or condensation of water vapor. In meteorological terms, fog is typically distinguished from mist by denser visibility limitations, with visibility often reduced to less than 1 kilometer (or 1 mile) in many classifications, though specific thresholds vary by region. Beyond meteorology, fog carries figurative meanings: something that obscures clarity or understanding, as in thinking being clouded or a situation shrouded in ambiguity. In everyday usage, you may hear phrases like 'a fog settled over the valley' or 'we drove through the fog on the highway.' The word is commonly used in both literal weather contexts and metaphorical expressions about uncertainty, confusion, or lack of insight. As a noun, fog does not typically take plural morphology in ordinary use, though you may encounter poetic or literary pluralizations in specific stylistic contexts.