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.


  1. nautical
    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
  2. a skylight designed not to be opened
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