clerestories

/K L EH1 R IH0 S T AO1 R IY0 Z/
noun
  1. 1

    The upper part of a wall containing windows to let in natural light to a building, especially in the nave, transept and choir of a church or cathedral.

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Source: https://en.wiktionary.org/wiki/clerestories, https://en.wiktionary.org/wiki/clerestory