fenestration

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

An opening, a window, an interstice.

The arrangement and design of windows in a building.

1. the act of perforating or the condition of being perforated.
2. the surgical creation of a new opening in the labyrinth of the ear for the restoration of hearing in otosclerosis.

• aortopulmonary f. — aortic septal defect.
• f. heart valves — naturally occurring fenestrations are common in horses and cause development of cardiac murmurs, especially audible in foals. They appear to be congenital and to exert no significant deleterious effect.