Many terms are used in woodworking; some have meanings in our everyday life but others are peculiar to the craft and may have different meanings in ordinary usage. Arris A sharp edge of wood left when an angle is formed. It is often rounded off or radiused to avoid damage.
Chamfer To remove an edge or corner for protection or decoration. Normally the cut is made at 45 degrees, but this angle can be varied. Bevel In some ways similar to a chamfer and often confused with it, a bevel is where the whole edge is planed at an angle other than 90 degrees.
Rebate Where the edge of a member is cut away in the form of a step it is said to be rebated. Surfaces of the rebate are normally parallel to the main surfaces, but can sometimes be bevelled.
14, with the grain. Across the grain this cut is called a trench, or dado in American terms. When two corners are joined to conceal end grain the joint is called a mitre. This need not be at 90 degrees, as shown in the example.