barrel vault

This term describes a specific architectural element characterized by a continuous semicircular arch. It is most commonly associated with Romanesque architecture, where it provided a heavy, imposing sense of permanence and strength, though it required thick walls to support the outward thrust of the stone.

In modern architectural descriptions, it is often contrasted with the groin vault, which is formed by the intersection of two barrel vaults at right angles. While a barrel vault is a simple extrusion of a single arch, the groin vault allows for more light and flexible space by concentrating the weight on four corner points rather than along the entire length of the walls.