A mixture of gravel, pebbles, or broken stone with cement or with tar, etc., used for sidewalks, roadways, foundations, etc., and esp. for submarine structures.
A mixture of cement, sand, gravel and water that hardens into a stone- like substance. It can be poured into molds to make concrete blocks, or to make the frame of a building, or even to form the entire building.
A mixture of sand, coarse aggregate (crushed gravel or crushed stone), Portland cement and water correctly called Portland cement concrete. The wet mixture is placed in a form or trench and dries to a hard material.