The wedge-shaped, often embellished voussoir at the crown of an arch.

An arch constructed of individual stone or brick voussoirs.

Any of the wedge-shaped units in a masonry arch or vault, having side cuts converging at one of the arch centers.

The height of an arch from the spring line to the highest point of the intrados.

The first voussoir resting on the impost of an arch.

The exterior curve, surface, or boundary of the visible face of an arch.

A decorative molding or band on the face of an arch following the curve of the intrados.

The inner curve or surface of an arch forming the concave underside.

The point at which an arch, vault or dome rises from its support.

Also known as Springing

The highest part or point of a convex construction, such as an arch, vault, roadway.

Either side of an arch curving down from the crown to the impost.

Definition of Impost, except?

Also known as Spandril

The triangular-shaped, sometimes ornamented area between the extrados of two adjoining arches, or between the left or right of an arch and the rectangular framework surrounding it.

Any of several concentric rings of masonry forming an arch, especially when each projects beyond the one below.

A temporary framework for supporting a masonry arch or vault during construction until the work can support itself.

A crosspiece connecting the ribs in a centering.

Also known as Bolster.

An Archway having sides or jambs not at right angles with the face of its abutments.

A board used as centering for a flat arch, slightly crowned to allow for settling of the arch.

Also known as Camber Slip

An arch shaped to develop only axial compression under a given loading.

It is the funicular shape for an arch carrying a vertical load uniformly distributed along the length of the arch axis.

It is the funicular shape for an arch carrying a vertical load uniformly distributed over its horizontal projection.

An arch structure of timber, steel, or reinforced concrete, constructed as a rigid body capable of carrying bending stresses.

The manner in which an arch transforms the vertical forces of a supported load into inclined components and transmits them to abutments on either side of the archway.

The median line of an arched structure.

The set of resultants of thrust and weight each part of an arch imposes on the next lower one.

The outward force or pressure exerted by one part of a structure against another.

The thrust of an arched structure on its abutments, proportional to the total load and span, and inversely proportional to the rise.

A fixed frame structure having an arched form.

A two-hinged frame structure having an arched form.

The part of a structure receiving and supporting the thrust of an arch, vault, or strut.

A three-hinged frame structure having an arched form.

True or False. Lateral Tie is a structural tie that keeps the lower ends of an arch or frame from spreading.

An iron or steel rod serving as a structural tie.

True or False. Is Rigid Arch capable of carrying bending stress?

True or False. Spandrel is sometimes ornamented.