rubble

rubble is a Noun

Definition:

[1] Water-worn or rough broken stones; broken bricks, etc., used in coarse masonry, or to fill up between the facing courses of walls. Inside [the wall] there was rubble or mortar. Jowett (Thucyd. ).

[2] 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. Brande & C.

[3] A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock. Lyell.

[4] The whole of the bran of wheat before it is sorted into pollard, bran, etc. [Prov.Eng.] Simmonds. Coursed rubble, rubble masonry in which courses are formed by leveling off the work at certain heights.