Definition from Wiktionary, the free dictionary
altbier (plural altbiers)
- A form of German top-fermenting beer that originated in Westphalia and later spread to parts of the Rhineland.
2007 January 24, Eric Asimov, “Quiet Cover for a Vital Brew”, New York Times:
- Their own version of brown ale, long the signature beer of the Düsseldorf region in northwestern Germany, is called altbier, literally old beer.