fenestration
Concise Oxford English Dictionary © 2008 Oxford University Press:
fenestration /ˌfɛnɪˈstreɪʃ(ə)n/
▶noun
- 1 Architecture the arrangement of windows in a building.
- 2 Botany & Zoology the condition of being fenestrate.
- 3 Medicine a surgical operation in which a new opening is formed, especially in the labyrinth of the inner ear to improve hearing.
'fenestration' also found in these Oxford entries:

