3		A vertical passageway through a building. (5)
4		A support usually of stone or brick; supports the wall of a building. (8)
7		A slight bulge in the shaft of a column. (7)
9		Panel forming the lower part of an interior wall when it is finished differently from the rest. (4)
11		A road that winds along the side of a steep coast or cliff. (8)
14		A painted or carved screen placed above and behind an altar or communion table. (7)
15		A plain plinth that supports a wall. (5)
17		A slender spire, especially one that emerges from the roof of a church at the point where the ridges intersect. (6)
18		An enclosure that is set back or indented. (5)

1		Of or relating to or characterized by transition. (12)
2		Not arcuate; having straight horizontal beams or lintels (rather than arches) (9)
3		Protective covering consisting of a metallic netting mounted in a frame and covering windows or doors. (6)
5		The lowest molding at the base of a column. (5)
6		An architectural support or base. (6)
8		A style of architecture developed in northern France that spread throughout Europe between the 12th and 16th centuries. (6)
9		Oldest and simplest of the three orders of classical Greek architecture. (5)
10		A pointed arch having an S-shape on both sides. (4,4)
11		A courtyard with covered walks. (8)
12		Lying toward or situated in the east. (7)
13		Out of proportion in shape. (3-5)
16		A curved shape in the vertical plane that spans an opening. (4)