IPA: /ˈtræn.sɛpt/
KK: /ˈtrænˌsɛpt/
A part of a church that crosses the main body at a right angle, forming a cross shape.
The cathedral's transept was beautifully decorated with stained glass windows.
Transept → It is formed from "trans-" (meaning across) and "septum" (from Latin, meaning wall or partition). The word "transept" refers to the part of a church that crosses the main body, creating a cross shape, thus extending across the main structure.
Picture a part of a church that extends 'across' ('trans-') the main area, like a wall or partition ('septum') — that's what a transept is.