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vault ![click to hear : vault click to hear : vault](../../../images/speaker-vert.gif)
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 : diagonal buttress click to hear : diagonal buttress](../../../images/speaker-vert.gif)
Arch connecting two of the vault’s corners through the keystone; it is also called an ogive.
tierceron ![click to hear : tierceron click to hear : tierceron](../../../images/speaker-vert.gif)
Rib connected to a lierne but not to the keystone.
lierne ![click to hear : lierne click to hear : lierne](../../../images/speaker-vert.gif)
Rib connecting the top of the tierceron to the keystone.
keystone ![click to hear : keystone click to hear : keystone](../../../images/speaker-vert.gif)
Wedge-shaped stone above the nave where the arches meet; it supports the arches and stabilizes the overall structure.
traverse arch ![click to hear : traverse arch click to hear : traverse arch](../../../images/speaker-vert.gif)
Arch that supports the vault and is perpendicular to the axis of the nave.