Noun
altbier (plural altbiers)
A form of German top-fermenting beer that originated in Westphalia and later spread to parts of the Rhineland.
"Altbier im Alltag" by Genno Fonk, 1999, page 11 Until recently the Pilsner Urquell brewery fermented its beer using open barrels in the cellars beneath their brewery. Source: Internet
People in Cologne prefer Kölsch while people in Düsseldorf prefer Altbier ("Alt"). Source: Internet