Definitions from Wiktionary (fenestration)

▸ noun:  (architecture) The arrangement of windows and similar openings in a building.
▸ noun:  (surgery, anatomy) An opening in the surface of an organ etc; the surgical creation of such an opening, especially one in the bony part of the inner ear made to improve hearing.
▸ noun:  (surgery, anatomy) An opening that occurs naturally or is created surgically, as through a biological membrane.
▸ noun:  (botany) Either a translucent area in a structure such as a leaf or flower petal, or an opening in a structure.
▸ noun:  (nautical) The practice of placing holes in the rudder of a ship to reduce the work required to move the rudder while preserving its ability to steer the ship.

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