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1. Nautical
a. A strong shutter or plate fastened over a ship's porthole or cabin window in stormy weather.
b. A thick window set in a ship's side or deck.
2. A skylight constructed so that it cannot be opened.


1. (Nautical Terms) nautical
a. a bull's-eye let into the deck or hull of a vessel to admit light to a cabin
b. a shutter of wood or metal for sealing off a porthole or cabin window
2. (Architecture) a skylight designed not to be opened



1. a strong shutter for the interior of a porthole in heavy weather.
2. a thick pane of glass set in a ship's hull or deck to admit light.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.deadlight - a strong shutter over a ship's porthole that is closed in stormy weather
porthole - a window in a ship or airplane
shutter - a hinged blind for a window
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References in classic literature ?
The boatswain died during a storm, so they wrapped him up in a sheet, and put him in his own sea chest, and threw him overboard; but they neglected, in their hurry-skurry, to say prayers over him, and the storm raged and roared louder than ever, and they saw the dead man seated in his chest, with his shroud for a sail, coming hard after the ship, and the sea breaking before him in great sprays like fire; and there they kept scudding day after day and night after night, expecting every moment to go to wreck; and every night they saw the dead boatswain in his sea chest trying to get up with them, and they heard his whistle above the blasts of wind, and he seemed to send great seas, mountain high, after them that would have swamped the ship if they had not put up the deadlights.
They probably didn't know the complexities of seamanship or the need to close the deadlights after they logically opened them for air needed in their hiding place, which allowed stormy lake water to pour into the ship.
Their recent single Deadlights is a lively mix of pop melodies with grunge guitars.