A self-contained weapons platform housing guns and capable of rotation(noun)
WordNet. Princeton University. 2010.
Use "gun turret" in a sentence
"While this was going on, the 747’s belly-mounted gun turret continued to swing left and right, raining hell on Kallis’s pursuing swampboats and the two remaining Apaches, keeping them at bay."
"*An explosion in the U.S.S. Iowa’s gun turret had killed forty-seven sailors on April 19 while the ship was participating in naval exercises near Puerto Rico."
"On June 6, Seydlitz was moved inside the harbor gates, but another week of caulking and pumping was necessary and the two 11-inch guns of the port wing gun turret were stripped out."