| Term | Definition | Tags |
| Rough Arch: | Constructed of two, three, or four rings of headers and used mainly for Segmental or Semi-Circular A... | |
| Segmental Arch: | Struck from one centre as the segment of a circle; can be set out to a given span and rise and sprin... | |
| Semi-Circular Arch: | A full semi-circular curve springing from a horizontal line. The parallel inner and outer curves are... | |
| Skewback: | The splayed cut, either side of an opening, to form the springing for a Segmental or Camber Arch. To... | |
| Soffit: | The underside of an arch.... | |
| Soldier Arch: | Not a true arch but rather a \joggled lintel". Widely used in housing the flat span is formed by ver... | |
| Span: | The clear horizontal distance between the arch supports.... | |
| Spandrel: | The curved triangular piece of wall between the haunches of adjoining curved arches as in an arcade.... | |
| Springing Line: | A horizontal line from which the lowest point of an arch commences at the extremities of the intrado... | |
| Striking Point: | The centre of a circular arch curve and the point from which the voussoirs radiate.... | |
| Three-Centred Arch: | Method of setting out an Approximate Semi-Ellipse that overcomes the practical problems of construct... | |
| Traversing: | Process used for setting out an arch. The line of the intrados is marked on the face templet which i... | |
| Tudor Arch: | This four-centred arch, with its clearly defined compound curve, is one of the most popular of arch ... | |
| Turning Piece: | A temporary support for small arches. Made from one piece of solid timber, that is cut to the requir... | |
| Voussoir: | Stretcher or Header that is cut to a wedge shape and used to build an arch.... | |
| Welsh Arch: | Formed to bridge over small openings needed for airbricks or ducting. It is a flat arch cut from thr... | |
