Intrados:
The inner curve of the arch is called intrados
Extrados:
The exterior curve of an arch is called extrados. It is also sometimes called back.
Soffit:
Soffit is the term used to describe the inner surface of the arch.
Crown
The summit or highest point on the extrados is called crown
Abutment
The end supports of an arch are called abutments.
Piers
If abutment is the end support of an arch, piers are the intermediate supports of an arch.
Span
The horizontal clear distance between the supports is called span.
Center
The curve of an arch will have a geometric center, and that geometric center is called the center of an arch.
Springing points
The imaginary points from which the curve of an arch begins/springs
Springing line
If we join the springing points, we get springing line.
Arcade
A row of arches that supports a wall above and is itself supported by piers is called an arcade.
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