noun the whole of the bran of wheat before it is sorted into pollard, bran, ·etc.
2. rubble ·noun a mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock.
3. rubble ·noun water-worn or rough broken stones; broken bricks, ·etc., used in coarse masonry, or to fill up between the facing courses of walls.
4. rubble ·noun 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.