grav·el 
/ˈgrævəl/ noun
/ˈgrævəl/ noun [noncount] : small pieces of rock
▪ a layer of gravel — often used before another noun ▪ a gravel road [=a road with a top surface made of gravel] ▪ a gravel pit [=a large hole in the ground where gravel has been dug up]
▪ a layer of gravel — often used before another noun ▪ a gravel road [=a road with a top surface made of gravel] ▪ a gravel pit [=a large hole in the ground where gravel has been dug up]
