deadlight \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.deadlightsplural, slang: eyes