SHIFT n.
In building, the extent, or arrangement, of the overlapping of plank, brick, stones, etc., that are placed in courses so as to break joints.
STRUCTURE n. 2 definitions
Arrangement of parts, of organs, or of constituent particles, in a substance or body; as, the structure of a rock or a mineral; the structure of a sentence. It [basalt] has often a prismatic structure. Dana.