A "turret" is a small, round, or square tower built on top of a building or vehicle. It is often used for protection, defense, or as a lookout point. Full definition
If you like general multiplayer Deathmatches, you'll probably like this, too, and the addition of turret building is a cool little twist. (coed.com)
So then you're dodging missiles and taking out enemy fighters; Reyes needs to get in close to a vast enemy destroyer and start pounding its gun turrets with 50 mm cannon fire. (theguardian.com)
As you continue down Franklin Street, buildings with turrets on the corners of Eagle Street and also Freeman Street will charm your eye. (brooklyneagle.com)