deadlight

from WordNet (r) 3.0 (2006)
deadlight
    n 1: a strong shutter over a ship's porthole that is closed in
         stormy weather
from The Collaborative International Dictionary of English v.0.48
Deadlight \Dead"light`\, n. (Naut.)
   A strong shutter, made to fit open ports and keep out water
   in a storm.
   [1913 Webster]
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