WordReference Random House Unabridged Dictionary of American English © 2019
fen•es•tra•tion  (fen′ə strāshən),USA pronunciation n. 
  1. Architecturethe design and disposition of windows and other exterior openings of a building.
  2. Furniturean ornamental motif having the form of a blind arcade or arch, as in medieval cabinetwork.
  3. Medicine, Surgery
    • a perforation in a structure.
    • an operation to effect such an opening.
    • Also called  fenestration opera′tion, Lempert operation. the creation of an artificial opening into the labyrinth of the ear to restore hearing loss from otosclerosis.
  • Latin fenestrāt(us) (see fenestrated) + -ion
  • 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::

fenestration /ˌfɛnɪˈstreɪʃən/ n
  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

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