- 
						DendrochronologyMethod of dating wood through the study of the annual rings.
 - 
						Detached columnCylindrical column situated against a pillar or wall.
 - 
						Diaphragm archInternal gable wall mounted on a transversal arch placed between two bays.
 - 
						DistemperA water-soluble paint using egg-yolk or glue size as a binder.
 
- 
						Dome
 - 
						DonjonThe principal tower of a castle, usually in the centre.
 - 
						DoorwayMonumental door integrated into a facade, giving access to a building
 - 
						Double ring archArch with a double row of quoins.
 
- 
						DrawbridgeMobile bridge over a moat, the deck of which lifts up to prevent access to the castle
 - 
						DripstoneProjection from the cornice designed to prevent water running down the walls.
 - 
						DrumCylindrical-shaped stone.