From Wiktionary, the free dictionary
alt (“old”) + Bier, brewed in the old way.
Altbier n (strong, genitive Altbieres or Altbiers, plural Altbiere)
- altbier (form of German top-fermenting beer)
- Synonym: Alt
Declension of Altbier [neuter, strong]
- “Altbier” in Duden online
- “Altbier” in Digitales Wörterbuch der deutschen Sprache