Direct Answer • Key Takeaway
: An Opening (As in a Ship's Side, a Gun Turret, a Pillbox, or the Nose, Fuselage, or Wing of an Airplane) Through Which a Gun Can Be Fired.
: An Opening (As in a Ship's Side, a Gun Turret, a Pillbox, or the Nose, Fuselage, or Wing of an Airplane) Through Which a Gun Can Be Fired.
: An Opening (As in a Ship's Side, a Gun Turret, a Pillbox, or the Nose, Fuselage, or Wing of an Airplane) Through Which a Gun Can Be Fired.