Fenestration is a part of my house. Yours too, I bet. 
The definition of fenestration is any opening in a building’s envelope including windows, doors and skylights. It also refers to the design and placement of windows in buildings.
The origin of the word is from the Latin word for window—fenestra.
Other lesser definitions for the word are more scientific. The term fenestration is used in botany to refer to natural holes in leaves of some plants.
Additionally, it means the surgical creation of an artificial opening in the bony part of the inner ear to improve or restore hearing.
Exploring the use, misuse and humor of words 