ground

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noun – the solid surface of the earth. Hail being much denser and heavier than snow, falls at a much faster rate and can reach the ground even with the 0° isotherm at 10,000 ft. verb – 1. to prohibit an aircraft or member of an aircrew from flying. The pilot was grounded after failing a medical examination. 2. US to connect an electrical circuit to a position of zero potential. While refuelling a light aircraft it is important to ground the airframe to prevent sparking caused by static electricity. (NOTE: To earth is preferred in British English.)

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