vbl. sb. [f. CREST sb. (sense 6) + -ING1.] Arch. An ornamental ridging to a wall or roof.
1869. Builder, 18 Dec., 998/2. The lines of a building are best followed by … placing crestings where objects would be artistically enriched by them.
1870. F. R. Wilson, Ch. Lindisf., 48. Roofs … finished with ornamental tiled cresting.
