Fenestration or fenestrate may refer to:
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Fenestration (architecture), relating to openings in a building
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Fenestra, in anatomy, medicine, and biology, any small opening in an anatomical structure
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Leaf window, or fenestration, a translucent or transparent area in a plant leaf
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Perforate leaf, sometimes described as fenestrate, a leaf that develops large holes as it grows
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Fenestration, holes in the rudders of some ships, supposedly giving greater control
See also
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Defenestration, the act of throwing someone or something out of a window
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National Fenestration Rating Council, an American organization that evaluates the energy performance of fenestration products