Dead lights


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.

1720–30; dead + light1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deadlight (ˈdɛdˌlaɪt)
1.  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.  a skylight designed not to be opened

Collins English Dictionary - Complete & Unabridged 10th Edition
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