deadlight
/ˈdɛdˌlaɪt/
noun
- A strong cover or shutter for a ship's porthole or window, used to keep out water during storms.
- The crew fastened the deadlights before the storm hit.
- He checked that all deadlights were securely closed before leaving port.
- A deadlight protects the cabin from waves breaking against the hull.
- A window that does not open, especially in a building or vehicle.
- In older houses, deadlights were common in stairwells.
- The van's rear windows are deadlights for extra security.
- The basement has a deadlight that lets in light but cannot be opened.