Dead lights

deadlight

[ded-lahyt]
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:
1720–30; dead + light1

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World English Dictionary
deadlight (ˈdɛdˌlaɪt)
 
n
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

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