bottom fermentation

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Related to bottom fermentation: top fermentation
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Noun1.bottom fermentation - 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
fermenting, zymolysis, zymosis, fermentation, ferment - a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol
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That includes precision control, within a degree or two of tolerance, of the hot water that first hits the malted grain--a process called "striking"--and further along, propylene glycol jackets to keep temperatures for top fermentations (ales) and bottom fermentations (lagers) at their respective targets.