Webster's English Dictionary

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clerestory

clere.sto.ry or clear.sto.ry \'kli(*)r-.sto-r-e-, -.sto.r-\ n [ME, fr. 
   clere clear + story] 1: an outside wall of a room or building carried above 
   an adjoining roof an d pierced with windows 2: GALLERY  3: a ventilating 
   section of a railroad car roof