Originally, masonry was the art of building a structure from stone. Today, it
refers to construction consisting of units held together with mortar, such as
concrete block, stone, brick, clay tile products, and, sometimes, glass block.
The characteristics of masonry work are determined by the properties of the
masonry units and mortar and by the methods of bonding, reinforcing, anchoring,
tying, and joining the units into a structure.
(Photo courtesy U.S. Dept. of Labor)