[U]nity: a principle of Beauty, that the work of art shall present an organic oneness and completeness.
[V]ault: an arched covering of stone, brick or concrete over any space. Barrel vault: a continuous semicircular arched covering over an oblong space, supported on the side walls. Groined vault: a vault formed by the intersection of two barrel vaults, at right angles to each other, supported on four corner columns or piers. Rib vault: a development of the groin vault, the groins being replaced by ribs or profiled bands of masonry, which are erected first, the vaulting spaces being filled in subsequently.
Vestibule: the walled space before the entrance to a Roman house; later an enclosed or partially enclosed entrance space beneath the roof of an early Christian church; generally, the entrance space of any building, especially, if used for public assemblage.
Volute: the scroll or spiral feature occurring in a capital of the Ionic and Corinthian Orders.
Voussoir: one of the wedge-shaped stones, composing the curve of an arch.
[W]ainscot: the lining or panelling of an interior wall, skirting the floor and carried up to only a part of the height of the wall.
Wheel window: See Rose-window.
[Z]iggurat: (a “holy mountain”): the platform usually Stepped or rising in receding tiers, on which the Chaldæans erected a temple; they were also used for astronomical observations.