bottom yeast

noun

a yeast whose cells, in the manufacture of wine and lager beer, fall to the bottom as a sediment.

Origin of bottom yeast

First recorded in 1905–10

Microscopic examination of the yeast, however, showed the same to be bottom yeast.
Scientific American Supplement, No. 315, January 14, 1882 | Various
Of the higher sugars raffinose is fermented by juice from bottom yeast, but more slowly than cane sugar or maltose.
Alcoholic Fermentation | Arthur Harden
It has not, however, been possible to transform a typical top yeast into a permanent typical bottom yeast.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 | Various
Sometimes a bottom yeast may for a time exhibit signs of a top fermentation.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 | Various

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