What is a voissoir?

A voissoir is correctly identified as a wedge-shaped masonry unit in an arch. This term is specifically used to describe the individual blocks that make up the curved or angled sections of an arch. The geometry of a voissoir allows it to distribute weight effectively, enabling the arch to bear loads from above. The shape of a voissoir, being wider at one end and tapered at the other, contributes to the stability and strength of the arch structure, making it an essential component in the construction of arches in various architectural styles throughout history. This design not only aids in structural integrity but also plays a role in the aesthetic aspect of arch construction. Understanding the function and significance of voisiúrs is crucial in the study of architectural history, particularly in the context of Roman and Gothic architecture, where arches are prominently used.