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[ded-lahyt] /ˈdɛdˌlaɪt/
noun, Nautical.
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.
Origin of deadlight
1720-30; dead + light1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for deadlight
Historical Examples
  • Then I flooded the boat rapidly through the deadlight till the water came to the level of the coaming.

    The Story of Our Submarines John Graham Bower
  • "Fully committed," muttered Denman, as he drew back from the deadlight.

    The Wreck of the Titan Morgan Robertson
  • It was hot in the room, and rather dark, as the deadlight to the poop-deck was fogged by sea water.

    Isle o' Dreams Frederick F. Moore
  • Then he entered an opposite room—all were unlocked now—from which, slantingly through the deadlight, he saw lights.

    The Wreck of the Titan Morgan Robertson
  • Foster remained, moodily staring through the deadlight, while the other two went forward.

    The Wreck of the Titan Morgan Robertson
  • Then Ross casually glanced at the deadlight, and violently forced the girl to her seat.

    The Wreck of the Titan Morgan Robertson
  • Remembering his embarrassment of the morning, Denman did not seek the deck, but looked through his deadlight.

    The Wreck of the Titan Morgan Robertson
  • He drew back to avoid a brick that threatened to enter the deadlight, and the conversation ended.

    The Grain Ship Morgan Robertson
  • As the deadlight had been closed over the port, the state-room was illumined only by a gray half-gloom from the cabin.

    The Harbor Master Theodore Goodridge Roberts
  • Under this head may also be mentioned the Funa'l or deadlight, which was lighted in some churchyards at night.

British Dictionary definitions for deadlight


  1. a bull's-eye let into the deck or hull of a vessel to admit light to a cabin
  2. a shutter of wood or metal for sealing off a porthole or cabin window
a skylight designed not to be opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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