Deadlight is a {vgy|2012} sidescrolling survival horror/cinematic platforming video game for Xbox 360 and Microsoft Windows, developed by Tequila Works and published by Microsoft Studios. It was released for Xbox 360 via Xbox Live Arcade on August 1, and for Windows via Steam on October 25. In 2014, Deadlight was available for free to Xbox Live Go... Found on http://en.wikipedia.org/wiki/Deadlight
On a ship, a deadlight or dead-light is a hinged steel cover (formerly a wooden shutter) used to cover the glass of a port hole during heavy weather. Found on http://www.probertencyclopaedia.com/browse/RD.HTM
Either a cover clamped over a porthole to protect it in heavy weather or a fixed light set into the deck or cabin roof to provide light below. Found on http://www.sailinglinks.com/glossary.htm
a strong shutter able to be screwed against the interior of a porthole in heavy weather. · a thick pane of glass set in the hull or deck to admit light. Found on https://www.infoplease.com/dictionary/deadlight