Learn how to say Clerestory correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word clerestory:
noun (plural clerestories)
the upper part of the nave, choir, and transepts of a large church, containing a series of windows.
a series of windows in another large building that are similar to those in a clerestory.
a raised section of roof running down the centre of a railway carriage, with small windows or ventilators.
late Middle English: from clear + storey