The transverse arm, north or south, of a cross-shaped church.
Slype
The basilica plan features a rectangular layout with a central nave flanked by side aisles, often culminating in an apse at one end, and may include a transept to create a cross shape. Architectural elements commonly include tall columns, a clerestory for light, and a raised platform for the altar. In contrast, the central church plan typically emphasizes symmetry and geometric shapes, such as circles or squares, often with a dome above the central space. This design focuses on directing attention towards the altar, usually located at the center of the structure.
Roughly, Gothic architecture, mainly in churches and cathedrals, has arches that come to a bit of a point at the top, steeply-pitched stone roofs (previous architecture had flatter wood roofs that would burn and collapse into the church), and had interior outer aisles with clerestory windows up high, and also vaulted ceilings whose crossings feature groined 'joints'.
the Crossing
Choir or transept.
Slype
Transept The ground plan of many churches forms the shape of a cross. The two 'arms' of the cross are the transepts.
The Slype is a covered passage, especially one from the transept of a cathedral to the chapter house. It is famous that a Slype is a covered passageway in a cathedral or church that connects the transept to the chapterhouse.
A transept altar is an altar located within the transept of a church, which is the area that intersects the main body of the church (the nave) at right angles. This design is often found in cruciform (cross-shaped) churches and allows for additional worship space and ceremonial functions. Transept altars may be used for special services or as a focal point for specific devotional practices, enhancing the liturgical experience. They can also provide a visually distinct area for the congregation, separate from the main altar.
Slype - found in Chambers Dictionary
This is called the 'transept' and its purpose is to provide separation between the Sanctuary and the Nave. Sometimes the transept will include an area for the choir (although a loft is more common) and/or statuary, or side altars.
Poets corner
If you mean the side arms of a church, it is called "the transept". Each of the two may contain a chapel.
Sunday Express: transept
A transept actor refers to a performer in a specific genre of theater that often involves religious or moral themes, particularly in medieval mystery plays. In this context, "transept" typically relates to the architectural feature of a church, signifying the area that intersects with the main body, where dramatic performances may have historically taken place. These actors would typically portray biblical figures or moral allegories, engaging the audience in narratives that reflect spiritual teachings.