Definition of fenestration
1
: the arrangement, proportioning, and design of windows and doors in a building
2
: an opening in a surface (such as a wall or membrane)
3
: the operation of cutting an opening in the bony labyrinth between the inner ear and tympanum to replace natural fenestrae that are not functional
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Merriam-Webster unabridged
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Time Traveler for fenestration
The first known use of fenestration was in 1846
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