| MENISCUS | What is the convex or concave upper surface of a column of liquid (8) |
| LENSES | They might be convex or concave |
| CORNEA | The convex transparent layer of tissues that forms the anterior part of the eyeball (6) |
| MIRROR | A looking-glass such as the convex specimen represented in Jan van Eyck's Arnolfini Portrait or the concave example in Sir Isaac Newton's reflecting telescope (6) |
| CAMBER | The slightly convex or arched shape of a road (6) |
| BACKBONE | A column of people (8) |
| DORSAL | Belonging to or on or near the back or upper surface of an animal or organ or part. |
| INCH | Unit of pressure exerted by a column of mercury in a barometer; one twelfth of a foot or 2.54 cm; or, a unit of rainfall in meteorology (4) |
| ROOFTOP | On the upper surface of a building, a ... garden |
| LAP | The area formed by the upper surface of the thighs of a seated person (3) |
| KNEE | The upper surface of a seated person's thigh (4) |
| BELLY | Bulge out like the upper surface of a violin (5) |
| CEILING | The inner upper surface of a room (7) |
| CEIL | Slather plaster on the upper surface of a room |
| INSTEP | What is the arched upper surface of the human foot (6) |
| LINE | A column of soldiers, crocodile of schoolchildren, queue of traffic, row of chessboard squares or other line-like formation; or, a dossier (4) |
| REGLET | Word, from French for "little rule", for a column of a page originally, later a narrow band separating mouldings; a fillet; or, a strip of wood for making white spaces between type in printing (6) |
| CEILINGS | Upper surfaces (8) |
| AGNAIL | Piece of torn skin on the upper surface of the fingertips (6) |
| POLYGON | A "many-sided" closed shape observed in things from a crystal, honeycomb, snowflake or star fruit slice to a column of basalt rock, frozen puddle, plant stem crosssection or slither of cracked ice (7) |
