A type of strong lager chilled to sub-zero temperatures after fermentation so that ice crystals may be strained off, thereby concentrating the flavour and alcohol content. Cf. ice beer n. at ice n. Compounds 8.
1977 M. Jackson World Guide to Beers 52 (caption) The eisbock... In Northern Bavaria, the Erste Kulmbacher brewery produces the world's strongest beer.
1991 Mod. Brewery Age (Nexis) 15 July s36 Another nuance is the eisbock, or ‘ice’ bock, a beer that has been frozen to remove excess water, thereby creating a much more concentrated and potent beer.
2002 Toronto Star (Electronic ed.) 27 June, Where once ground-breaking beers like Niagara Falls Eisbock and Wellington County's Arkell Best Bitter defined the craft brewery renaissance, duplication rather than innovation began to hold sway.