1. A tool fashioned from sheet steel and having a toothed edge along the long dimension; used to level and scratch plaster to produce a key for the next coat of plaster. Also known as comb.

2. A tool consisting of a steel plate with a finely serrated edge; dragged over the surface to dress stone.

Resistance caused by friction in the direction opposite to that of the motion of the center of gravity of a moving body in a fluid.

1. The bottom part of a flask used in casting.

2. In thermal cutting, the distance deviating from the theoretical vertical line of cutting measured along the bottom surface of the material.

Movement of the hanging wall with respect to the foot wall due to the weight of the arch block in an inclined slope.