From Wiktionary, the free dictionary
Salpeter m (strong, genitive Salpeters, no plural)
- niter, saltpeter (US); nitre, saltpetre (UK)
Declension of Salpeter [sg-only, masculine, strong]
- “Salpeter” in Duden online
- “Salpeter” in Digitales Wörterbuch der deutschen Sprache