Chamfer
A symmetrical angled cut that removes the sharp 90-degree corner of a board, creating a flat beveled edge typically at 45 degrees for decoration, safety, or to reduce splintering.
In-Depth Explanation
Chamfering is one of the most common edge treatments in woodworking and construction. A chamfer differs from a full bevel in that it only removes the corner rather than the entire edge, and differs from a round-over in that it creates a flat angled surface rather than a curve. Chamfers can be cut with a router and chamfer bit, a table saw with a tilted blade, or a hand plane. In timber framing, decorative chamfers called lamb's tongues are a traditional embellishment where the chamfer gradually transitions back to a sharp corner. Many pressure-treated deck boards and dimensional lumber come with factory-applied eased edges or small chamfers.
Usage Example
I used a 45-degree chamfer bit in the router to knock off the sharp edges on all four corners of the cedar porch posts.