DICT.TW Dictionary Taiwan

 Grav·el n.
 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.