From Wiktionary, the free dictionary
ab- + Dampf
Abdampf m (strong, genitive Abdampfes or Abdampfs, plural Abdämpfe)
- exhaust steam, waste steam
Declension of Abdampf [masculine, strong]
- “Abdampf” in Duden online
- “Abdampf” in Digitales Wörterbuch der deutschen Sprache