| PERPENDICULAR | A straight line at right angles to a given line, plane or surface (13) |
| NORMAL | Line at right angles to a given line or surface |
| SYMMETRY | Exact correspondence on either side of a dividing line, plane or axis; beauty of form; or, balance (8) |
| EVEN | In a straight line, at the end of the day (4) |
| LEVEL | Horizontal line / plane / to flatten out |
| ABEAM | On a line at right angles to a ship or an aircraft's length (5) |
| SIDE | Long edge, position or surface to the left or right of an area, object or person, as opposed to its top or bottom; a page; a slope of a hill; a team; or, a television channel (4) |
| TORES | A solid or surface in the form of a bagel or a ring doughnut; a tokamak; the receptacle of a flower such as a daisy; or, in classical architecture, a moulding above a column's plinth (5) |
| HOE | A tool with a flat blade attached at right angles to a long handle. |
| SQUARE | L- or T-shaped instrument for drawing lines at right angles; or, a carpenter's measure (6) |
| OBLIQUE | Which term describes neither perpendicular nor parallel to a given surface or line (7) |
| INSTINCT | The innate capacity to respond to a given stimulus in a relatively fixed way (8) |
| ADZE | Hand tool consisting of an arched blade set at right angles to a long handle, used for trimming and shaping wood (4) |
| COORDINATE | A set of numbers used in specifying the location of a point on a line or surface or in space (2,8) |
| NODE | In geometry, a point at which a curved line or surface crosses itself (4) |
| TOTEM | Animal or natural object considered by primitive people as blood relations to a given family |
| EDGE | A boundary line or margin of an area or surface |
| TABLET | A flat slab or surface, especially one bearing or intended to bear an inscription. (6) |
| CRAMBO | Parlour game involving finding rhymes to a given word (6) |
| AXLELOAD | Total weight bearing on the roadway for all wheels connected to a given rod |
