| SPANDREL | In architecture, the near triangular space between the curve of an arch and the framework above |
| EIFFEL | Engineer who designed Paris' landmark tower and the framework of the Statue of Liberty |
| EXTRADOS | Exterior curve of an arch (8) |
| WEBB | Architect whose London designs include the facade of Buckingham Palace the Admiralty Arch and the frontage of the Victoria and Albert Museum (4) |
| ULLAGE | The quantity by which a container falls short of being full; or, the empty space between the cork and the top of the wine in a bottle (6) |
| ENTABLATURE | In classical architecture, the part of a building between the capital and the roof, comprising an architrave, frieze and cornice (11) |
| ABACUS | In architecture, the flat upper part of the capital of a column |
| ASTEROIDBELT | The region of space between the orbits of Mars and Jupiter in which many minor planets are located (8,4) |
| CRYSTALLINESPHERE | The space between the fixed stars and the primum mobile once said to explain precession of the equinoxes |
| PLINTH | In architecture, the rectangular slab at the base of a column or similar structure, also known as a socle (6) |
| FOOT | Locale of an arch and sole |
| CUPID | From "desire", name of the Roman god of love to whose bow the curve of the upper lip is likened (5) |
| CORNICE | In architecture, the top projecting mouldings of an entablature (7) |
| NASH | Architect who designed Marble Arch and the layout of Regent's Park (4) |
| ARCH | Although used in ancient Mesopotamian brick architecture, the Romans were the first to use this shape in a wide range of structures |
| VALLEY | The space between The Hill's vantage point and the back street (6) |
| ATLAS | In architecture, the male equivalent of a caryatid |
| BURTON | Architect whose projects include the Palm and Temperate Houses at Kew, the Wellington Arch and screen at Hyde Park Corner and Athenaeum Club's clubhouse (6) |
| GOTHIC | Style of architecture characterised by the lancet arch and ribbed vault (6) |
| LORE | Space between the eye and the bill of a bird |
