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Definition of Bottom fermentation
1. Noun. A slow kind of alcoholic fermentation at a temperature low enough that the yeast cells can sink to the bottom of the fermenting liquid; used in the production of lager.
Definition of Bottom fermentation
1. Noun. (context: brewing) A slow alcoholic fermentation process carried out at low temperatures during which the yeast sinks to the bottom of the liquid. Used in brewing lager-type beers. ¹
¹ Source: wiktionary.com