Rŭb'ble, n.

n. 1. (Mining.) (a.) The upper fragmentary and decomposed portion of a mass of stone. (b.) A mass or stratum of fragments of rock lying under the alluvium, and derived from the neighboring rock. [Prov. Eng.] Lyell.

2. Water-worn or rough stones, broken bricks, &c., used in coarse masonry, or to fill up between walls.
3. The whole of the bran of wheat, before it is sorted into pollard, bran, &c. [Prov. Eng.]