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Rubble, ruble
 A term used to describe all masonry which is not finely-jointed and laid in regular courses (Ashlar). Commonly encountered types of rubble are coursed, random, and snecked. In coursed and snecked rubble the stones are dressed square, and in random rubble the stones are more irregular, the spaces between them being filled with small stones known as pinnings. In Caithness and Orkney the local flagstone splits easily into slabs, and walls are frequently built up from such slabs, a technique known as flagstone rubble. In drystone rubble there is no mortar in the joints. Even where a wall is faced with dressed stone, the interior face is frequently built of random rubble.
Related Words Ashlar; Course, coursed; Masonry; Pinnings
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