Schrittmacher

German

Schrittmacher m (strong, genitive Schrittmachers, plural Schrittmacher)

(medicine) clipping of Herzschrittmacher (“pacemaker”) (medical device implanted to regulate heart rhythm); colloquial usage includes implantable cardioverter-defibrillators (ICD) and cardiac resynchronization therapy (CRT).
(physiology, anatomy) natural pacemaker
(sports) pacemaker, pacesetter; a runner who runs at a specific pace at the start of a race