top fermentation

Top fermentation

Top fermentation\ An alcoholic fermentation during which the yeast cells are carried to the top of the fermening liquid. It proceeds with some violence and requires a temperature of 14-30[deg] C. (58-86[deg] F.). It is used in the production of ale, porter, etc., and of wines high in alcohol, and in distilling.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
top fermentation

noun
a violent kind of alcoholic fermentation at a temperature high enough to carry the yeast cells to the top of the fermenting liquid; used in the production of ale; "top fermentation uses a yeast that ferments at higher temperatures than that used for bottom fermentation" 
WordNet® 3.0, © 2006 by Princeton University.
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