BARREL
a semicircular vault unbroken by ribs
| UNDERPITCH
a barrel vault with small perpendicular vaults underneath
| GROIN
formed from intersection of two vaults
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QUADRIPARTITE
a four-part vault
| SEXPARTITE
a six-part vault
| TIERCERON
a vaulting rib starting from the intersection of two vaults
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FAN
a group of ribs springing from a point to form a vault
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