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.

Nearby words

  1. deaden,
  2. deadening,
  3. deadeye,
  4. deadfall,
  5. deadhead,
  6. deadline,
  7. deadlock,
  8. deadlocked,
  9. deadly,
  10. deadly nightshade

Origin of deadlight

First recorded in 1720–30; dead + light1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deadlight

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