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deadlight

[ded-lahyt] /ˈdɛdˌlaɪt/
noun, Nautical
1.
a strong shutter able to be screwed against the interior of a porthole in heavy weather.
2.
a thick pane of glass set in the hull or deck to admit light.
Origin
1720-1730
1720-30; dead + light1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dead light

deadlight

/ˈdɛdˌlaɪt/
noun
1.
(nautical)
  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
2.
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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6
6
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