1. the design and disposition of windows and other exterior openings of a building.
  2. Furniture. an ornamental motif having the form of a blind arcade or arch, as in medieval cabinetwork.
  3. Medicine/Medical, Surgery.
    1. a perforation in a structure.
    2. an operation to effect such an opening.
    3. Also called fenestration operation, Lempert operation.the creation of an artificial opening into the labyrinth of the ear to restore hearing loss from otosclerosis.


  1. the arrangement and design of windows in a building
  2. a surgical operation to restore hearing by making an artificial opening into the labyrinth of the ear

1870 in the anatomical sense, noun of action from Latin fenestrare, from fenestra “window, opening for light,” perhaps from Etruscan. Meaning “arrangement of windows” is from 1846. Related: Fenestrated.


  1. An opening in the surface of a structure, as in a membrane.
  2. The surgical creation of such an opening.
  3. The surgical creation of an artificial opening in the bony part of the inner ear to improve or restore hearing.
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