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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 is loose rock that is often rounded in shape from being worn by water at some point. Gravel can be used alone as fill, for gravel roads, or residential driveways. Gravel can also be used as a component of concrete or asphalt pavement.