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- (architecture) The arrangement of windows and similar openings in a building.
- (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.
- (surgery, anatomy) An opening that occurs naturally or is created surgically, as through a biological membrane.
- (botany) Either a translucent area in a structure such as a leaf or flower petal, or an opening in a structure.
- 2005, S. Tucker, Australian Systematic Botany, 19(3):193-210. p. 194:
- The terms ‘nectar window’ and ‘fenestration’ are used interchangeably for enlarged gaps on the adaxial side of the stamen sheath or tube. The fenestrations facilitate access to the nectaries by a pollinator.
- 2016 D. W. Armitage, Systematic Botany 103(4):780–785. p. 781
- Foliar traits unique to Darlingtonia include the presence of transparent light-transmitting fenestrations, ...
- (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.
opening in the surface of an organ, surgical creation of such an opening
fenestration f (plural fenestrations)