Spar deck

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Same as the upper deck.
Sometimes a light deck fitted over the upper deck.
(Naut.) the upper deck of a vessel; especially, in a frigate, the deck which is continued in a straight line from the quarter-deck to the forecastle, and on which spare spars are usually placed. See under Deck.

See also: Deck, Deck, Spar

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.