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From The Collaborative International Dictionary of English v.0.48:
Gravel \Grav"el\, n. [OF. gravele, akin to F. gr?ve a sandy shore, strand; of Celtic origin; cf. Armor. grouan gravel, W. gro coarse gravel, pebbles, and Skr. gr[=a]van stone.] 1. Small stones, or fragments of stone; very small pebbles, often intermixed with particles of sand. [1913 Webster] 2. (Med.) A deposit of small calculous concretions in the kidneys and the urinary or gall bladder; also, the disease of which they are a symptom. [1913 Webster] Gravel powder, a coarse gunpowder; pebble powder. [1913 Webster]