The ornamental design for defibrillator, as shown and described.
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1. Defibrillator
1.1 is a closed rear view.
1.2 is an open perspective view.
1.3 is a closed front view.
1.4 is a closed side view.
1.5 is a top view.
1.6 is a perspective view.
1.7 is an open side view.
1.1: closed rear view; 1.2: open perspective view; 1.3: closed front view; 1.4: closed side view; 1.5: closed top view; 1.6: closed perspective view; 1.7: open side view.