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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.
Definition of gravel. 1  1 obsolete : sand. 2  2a : loose rounded fragments of rockb : a stratum or deposit of gravel; also : a surface covered with gravel a gravel road. 3  3 : small calculi in the kidneys and urinary bladder.