key
The removable operating member of a lock. Photo from Buffalo History Museum, Buffalo, New York, 2023. 2. A wedge cross-reinforcing a miter joint or locking a tenon. 3. A wedge-shaped floor board. 4. A roughened surface that receives glued veneer. 5. The plaster or mortar extruded behind lath which, when hard, serves to hold the plaster in place. 6. A sinkage in tile or terra cotta to engage mortar. 7. The dominant tonal value of a drawing or painting. 8. A grooving or roughness applied to a surface to improve its bond with another surface. (Saylor, 1952)