gun deck

(formerly, on a warship) any deck, other than the weather deck, having cannons from end to end.

Origin of gun deck

First recorded in 1670–80

In a ship of war it should be below the lowest battery or gun-deck.

Barometer and Weather Guide |Robert Fitzroy
An instant later a shell aimed at the destroyers water line forward pierced the hull just below the gun-deck.

Dave Darrin and the German Submarines |H. Irving Hancock
Nor did her gun-deck appear to me particularly roomy for her burthen.

Impressions of America |Tyrone Power
Men on the gun-deck of the ram were hurled to the deck, with the blood streaming from their nostrils.

The Naval History of the United States |Willis J. Abbot.

Pilot John A. Lewis was standing on the after hatchway, a little above the gun-deck amidships.

Reminiscences of Two Years in the United States Navy |John M. Batten