upper deck

noun Nautical.

the uppermost continuous deck that is capable of being made watertight; freeboard deck.

Origin of upper deck

First recorded in 1585–95

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

When the admiral is on board he occupies the after-cabins on the upper-deck.
How Britannia Came to Rule the Waves
W.H.G. Kingston
We must heave some of our upper-deck guns overboard, Mr Block.
Ben Burton
W. H. G. Kingston
Once through the airlock they found themselves on the ship's upper-deck.
The Sargasso of Space
Edmond Hamilton
The Camperdown has only upper-deck cabins, and I shall have fresh air.
Letters from the Cape
Lady Duff Gordon
After the watch was set we laid ourselves down upon the upper-deck with no other covering than the starry heavens.
Narrative of a Voyage to India; of a Shipwreck on board the Lady Castlereagh; and a Description of New South Wales
W. B. Cramp