Flitch

A flitch is the complete set of veneer sheets (or, in solid lumber, boards) sliced sequentially from one log or log section, kept stacked and numbered in the exact order they were cut. Because consecutive slices from the same flitch share nearly identical grain and color, keeping a flitch together and using its sheets in sequence is what makes book matching and slip matching possible -- and what lets a large project use veneer or lumber from a single flitch to keep grain and color consistent across many panels or boards, rather than looking like it was assembled from unrelated stock.