Wane: The moon's decline vs. wood's worn edge

In common speech, wane means to decrease or diminish. The moon wanes as it moves toward the new phase. A person's confidence wanes over time. The word carries a sense of gradual fading or reduction.

In woodworking, a wane is something entirely different: a rounded or beveled corner on a board, typically found along an edge, where material is absent. This happens when a piece is cut from a log that was not perfectly squared, or during the squaring process itself. The missing wood exposes the bark line, and because the log's surface naturally follows a curve, the resulting edge is rounded rather than sharp. A waned board has these corners; a waney edge is one that remains uneven or sharp because the squaring was incomplete.

The presence of wanes is a practical concern for the carpenter and millworker. A waned edge may be acceptable for rough framing or structural work where appearance matters less than strength. For fine furniture or trim, where a clean, square edge is required, waned wood must be re-milled or rejected. The wane therefore represents a loss of usable material and a potential sorting point in production.

The shift in meaning reflects the physical reality of the sawmill. As a log is squared into boards, the outer portions, including the bark and cambium, are removed. When a log is not centered on the saw or is irregular in shape, the blade cannot take uniform thickness from all sides. The result is a board with one or more rounded, bark-edged corners: wanes. The term likely derives from the same root as the lunar wane, carrying the sense of something missing or worn away, but applied to wood rather than light.