the thin layer of air adjacent to the earth’s surface, usually considered to be less than 300 feet (91 meters) high.
See layer (sense 2)
[ground-lis] /ˈgraʊnd lɪs/ adjective 1. without rational basis: groundless fears. /ˈɡraʊndlɪs/ adjective 1. without reason or justification: his suspicions were groundless adj. Old English grundleas “bottomless, unfathomable, vast;” see ground (n.) + -less. Figurative sense of “unfathomable” is from early 14c. Related: Groundlessly; groundlessness.
noun, Physics. 1. .
[ground-ling] /ˈgraʊnd lɪŋ/ noun 1. a plant or animal that lives on or close to the . 2. any of various fishes that live at the bottom of the water. 3. a spectator, reader, or other person of unsophisticated or uncultivated tastes; an uncritical or uncultured person. 4. a member of a theater audience who […]
noun, Nautical. 1. a lead weight attached to a line, cast overboard in shoal water and allowed to pay out freely to show the speed of a ship and the force of the current.