Fenestration or fenestrate may refer to:

  • Fenestration (architecture), relating to openings in a building
  • Fenestra, in anatomy, medicine, and biology, any small opening in an anatomical structure
  • Leaf window, or fenestration, a translucent or transparent area in a plant leaf
  • Perforate leaf, sometimes described as fenestrate, a leaf that develops large holes as it grows
  • Fenestration, holes in the rudders of some ships, supposedly giving greater control

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