vault![click to hear](/images/speaker.jpg)
The vault of a Gothic cathedral rests on a series of arches that cross at the summit of the nave and are supported by lateral pillars.
diagonal buttress ![click to hear](/images/speaker.jpg)
Arch connecting two of the vault’s corners through the keystone; it is also called an ogive.
tierceron ![click to hear](/images/speaker.jpg)
Rib connected to a lierne but not to the keystone.
lierne ![click to hear](/images/speaker.jpg)
Rib connecting the top of the tierceron to the keystone.
keystone ![click to hear](/images/speaker.jpg)
Wedge-shaped stone above the nave where the arches meet; it supports the arches and stabilizes the overall structure.
traverse arch ![click to hear](/images/speaker.jpg)
Arch that supports the vault and is perpendicular to the axis of the nave.