Definition of rubble

• n. - Water-worn or rough broken stones; broken bricks, etc., used in coarse masonry, or to fill up between the facing courses of walls.
• n. - Rough stone as it comes from the quarry; also, a quarryman's term for the upper fragmentary and decomposed portion of a mass of stone; brash.
• n. - A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock.
• n. - The whole of the bran of wheat before it is sorted into pollard, bran, etc.