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a. A strong shutter or plate fastened over a ship's porthole or cabin window in stormy weather.
b. A thick window set in a ship's side or deck.
2. A skylight constructed so that it cannot be opened.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Nautical Terms) 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. (Architecture) a skylight designed not to be opened
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a strong shutter for the interior of a porthole in heavy weather.
2. a thick pane of glass set in a ship's hull or deck to admit light.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.