Sail vault

Sail vault - See dome.
Sala terrena - A round-floor room opening directly onto the garden, a feature especially of c17-c18 palaces.

Also called a sail vault.Sail vaultA square vault or dome of one continuous curve with the same diameter as the diagonal of the square, so that it rises from pendentives between arches.

See also: Shaft, Vault, House, Architecture, Villa