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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. n. 1. (Geological Science) an unconsolidated mixture of rock fragments that is coarser than sand. 2. (Geological Science) geology a mixture of rock fragments with diameters in the range 4-76 mm. 3. (Pathology) pathol small rough calculi in the kidneys or bladder.. 1. An unconsolidated mixture of rock fragments or pebbles. 2. Medicine The sandlike granular material of urinary calculi. tr.v. gravÂ·eled, gravÂ·elÂ·ing, gravÂ·els or gravÂ·elled or gravÂ·elÂ·ling. 1. To apply a surface of rock fragments or pebbles to. 2.