Pronunciation: (fen"u-strā'shun),[key] —n. 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. Med.,Surg. a. a perforation in a structure.
b. an operation to effect such an opening.
c. Also calledfenestra'tion opera"tion,Lempert operation. the creation of an artificial opening into the labyrinth of the ear to restore hearing loss from otosclerosis.