COMPOUND v. 2 definitions
o put together, as elements, ingredients, or parts, in order to form a whole; to combine, mix, or unite. We have the power of altering and compounding those images into all the varieties of picture. Addison.
CONCRETE n.
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.