A transverse rib () is the term in

architecture Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and construction, constructi ...

given to the rib of a

rib vault A rib vault or ribbed vault is an architectural feature for covering a wide space, such as a church nave, composed of a framework of crossed or diagonal arched ribs. Variations were used in Roman architecture, Byzantine architecture, Islamic a ...

which is carried across the

nave The nave () is the central part of a church, stretching from the (normally western) main entrance or rear wall, to the transepts, or in a church without transepts, to the chancel. When a church contains side aisles, as in a basilica-type ...

, dividing the same into

bays A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a ''gulf'', ''sea'', ''sound'', or ''bight''. A ''cove'' is a small, ci ...

. Although as a rule it was sunk in the

barrel vault A barrel vault, also known as a tunnel vault, wagon vault or wagonhead vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. The curves are ...

of the ''

thermae In ancient Rome, (from Greek , "hot") and (from Greek ) were facilities for bathing. usually refers to the large Roman Empire, imperial public bath, bath complexes, while were smaller-scale facilities, public or private, that existed i ...

'', it is found occasionally below it, as in the

piscina A piscina is a shallow basin placed near the altar of a church, or else in the vestry or sacristy, used for washing the communion vessels. The sacrarium is the drain itself. Lutherans and Anglicans usually refer to the basin, calling it a pisci ...

Baiae Baiae (; ) was an ancient Roman town situated on the northwest shore of the Gulf of Naples and now in the ''comune'' of Bacoli. It was a fashionable resort for centuries in antiquity, particularly towards the end of the Roman Republic, when i ...

and the so-called Baths of Diana (

Nymphaeum A ''nymphaeum'' (Latin : ''nymphaea'') or ''nymphaion'' (), in ancient Greece and Rome, was a monument consecrated to the nymphs, especially those of springs. These monuments were originally natural grottoes, which tradition assigned as habit ...

) at

Nîmes Nîmes ( , ; ; Latin: ''Nemausus'') is the Prefectures in France, prefecture of the Gard Departments of France, department in the Occitania (administrative region), Occitanie Regions of France, region of Southern France. Located between the Med ...

. In the Romanesque and Gothic styles it becomes the principal feature of the vault, so much so that ScottRobert A. Scott, ''The Gothic Enterprise: A Guide to Understanding the Medieval Cathedral'' University of California Press (2003) termed it the "master rib".

References

* Arches and vaults Church architecture {{Church-architecture-stub