Previous Term Next Term Pith The pith is the center of the tree that is typically recognized by a change in wood-grain color, which darkens with age. Pith is considered to be an unstable part of the wood that has a greater tendency to crack. Related Terms Fumed Wood Shirred Drapery Header Accordion Pleat Pencil Pleat Photochromic Flat Pleat Materials WoodFlooring Was this insightful? Yes No