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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 grit. 1  1a : sand, gravelb : a hard sharp granule (as of sand); also : material (as many abrasives) composed of such granules. 2  2 : any of several sandstones. 3  3a : the structure of a stone that adapts it to grindingb : the size of abrasive particles usually expressed as their mesh.