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Gravel(noun) small stones, or fragments of stone; very small pebbles, often intermixed with particles of sand. Gravel(noun) a deposit of small calculous concretions in the kidneys and the urinary or gall bladder; also, the disease of which they are a symptom. Gravel(verb) to cover with gravel; as, to gravel a walk.
Gravel may be classified by size as fine (1â2.5 mm), medium (2.5â5mm) and coarse (5â10 mm). It is classified by origin as fluvial, lacustrine, marine, and glacial. Gravel is used as a construction material, a coarse concrete aggregate, and a road-building material. Cemented gravel is called grit.