The correct spelling of the word "clerestorial" is actually "clerestory", /ˈklɪrəstɔːri/, with the stress on the second syllable. It refers to a section of a building with a row of high windows, located above eye level, which provides natural light and ventilation. The word comes from the Middle English "clerestorie" and the Old French "clerestore", meaning "clear" or "light". Despite its French origin, the word is spelled with an "-ory" ending, rather than the more common "-oire".
Clerestorial is an adjective used to describe architectural features or elements that are associated with clerestories. A clerestory refers to a section of a building, typically a taller structure such as a church or cathedral, where a series of windows or openings are placed at a higher level, usually above eye level, in the upper part of a wall.
Derived from the Latin word "clerestorium," meaning "clear-storey," a clerestory serves the purpose of introducing light and ventilation into a building. As such, the term clerestorial is used to describe anything pertaining to or resembling a clerestory.
In architectural contexts, a clerestorial design refers to the use of clerestories, often resulting in elevated ceilings, increased natural lighting, and improved air circulation. The clerestorial features can take the form of windows, openings, or even stained glass, depending on the architectural style and purpose of the building.
Beyond architecture, clerestorial can also be used metaphorically to describe any elevated or enlightened aspect of a particular subject. For example, one might refer to a book with profound insights as having a clerestorial quality, meaning it offers a higher level of understanding or illumination compared to other texts on the same topic.
In summary, clerestorial relates to a building's use of clerestories for improved lighting and ventilation, while it can also describe elements that provide elevated insight or understanding in a non-architectural context.
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Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.