"Defensive turrets" refer to stationary weapons or structures designed to protect an area from attacks, often by firing projectiles at any approaching threats. Full definition
This is the place where rare resources can be combined to create tools such as teleporters, automatic drills and pumps for mining, defensive turrets against Tarr, jump pads, and others. (newgamenetwork.com)
Or maybe the main deck should be the first target since destroying it halves the fire rate of a carrier's quite powerful defensive turrets? (wolfsgamingblog.com)
For example, the Engineer is able to use firearms and lay down defensive turrets while the Mesmer is a magical duelist relying on deception magic and quick strikes. (wolfsgamingblog.com)