clerestory
/ˈklɪəstərɪ/( <美> 亦作clearstory)
noun
(pl. -ies)
1- the upper part of the nave, choir, and transepts of a large church, containing a series of windows. It is clear of the roofs of the aisles and admits light to the central parts of the building.天窗阁楼, 高侧窗楼座（大教堂中堂、唱诗班席位、十字形耳堂的上部, 装有一组采光天窗或高侧窗）。
1.1
- such a series of windows in a church or similar windows in another building（教堂等建筑的）侧天窗, 高侧窗。
1.2
- a raised section of roof running down the centre of a railway carriage, with small windows or ventilators火车车厢顶窗。
词源
late Middle English: from CLEAR + STOREY .