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Meaning of deadlight

dead•light

Pronunciation: (ded'līt"), [key]
— n. Naut.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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