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. grāvan stone.] 1. Small stones, or fragments of stone; very small pebbles, often intermixed with particles of sand.
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.
Gravel powder, a coarse gunpowder; pebble powder.