fenestra

/fəˈnɛstrə/
noun
  1. A small opening or window-like structure, especially in anatomy (e.g., in the inner ear).
    • The anatomy diagram showed the location of the fenestra in the skull.
    • The fenestra in the inner ear helps transmit sound vibrations.
    • Surgeons carefully operated near the fenestra of the cochlea.
  2. A window or opening in a wall or building (architectural term).
    • The castle's fenestra was narrow, meant for defense rather than view.
    • The ancient church had a small fenestra above the altar.
    • Architects designed a circular fenestra to let in morning light.
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