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From Biology-Online Dictionary | Biology-Online Dictionary
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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.

3. (Science: geology) A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock.

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

Origin: From an assumed Old French dim. Of robe See Rubbish.