From Wiktionary, the free dictionary
nennen + -er.
Nenner m (strong, genitive Nenners, plural Nenner)
- denominator (the number or expression written below the line in a fraction)
- Antonym: Zähler (“numerator”)
Declension of Nenner [masculine, strong]
- “Nenner” in Duden online
- “Nenner” in Digitales Wörterbuch der deutschen Sprache