“Arch is a curved structural member which provides horizontal support.”
It is stronger than a beam.
The structural member which provides support to it at its supports is known as abutment.
The member which gives support to it after regular intervals is known as piers.
The member of an arch which is curved is known as arch ring.
The highest point on the curved structural members is known as crown.
The top most surface of the curved structural member is known as back.
The bottom most surface is known as soffit.
The parallel or horizontal distance between abutments is known as span.
The interior layer of arches is known as intrados.
The point from where the curvature of curve is drawn is known as center of these curves structural members.