ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : a metal cover or shutter fitted to air ports and fixed ports to keep out light and water
b. : a piece of heavy glass set in a ship's deck or hull to admit light
2. : a skylight that does not open
3. Scotland : a luminosity seen over graves : corpse candle
4. deadlights plural , slang : eyes