A thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface that obscures or restricts visibility (to a greater extent than mist; strictly, reducing visibility to below 1 km). Something that obscures and confuses a situation or someone's thought processes. The grass that grows in a field after a crop of hay has been taken. (with reference to a glass surface) cover or become covered with steam. Bewilder or puzzle (someone). Treat with something, especially an insecticide, in the form of a spray.