2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Yeast \Yeast\, n. [OE. [yogh]eest, [yogh]est, AS gist; akin to
D. gest, gist, G. gischt g["a]scht, OHG. jesan, jerian, to
ferment, G. gischen g["a]schen, g["a]hren, Gr ? boiled,
zei^n to boil, Skr. yas. [root]111.]
1. The foam, or troth (top yeast), or the sediment (bottom
yeast), of beer or other in fermentation, which contains
the yeast plant or its spores, and under certain
conditions produces fermentation in saccharine or
farinaceous substances; a preparation used for raising
dough for bread or cakes, and making it light and puffy;
barm; ferment.
2. Spume, or foam, of water.
They melt thy yeast of waves, which mar Alike the
Armada's pride, or spoils of Trafalgar. --Byron.
From WordNet r 1.6 [wn]:
yeast
n 1: a commercial leavening agent containing yeast cells; used to
raise the dough in making bread and for fermenting beer
or whiskey [syn: {barm}]
2: any of various single-celled fungi that reproduce asexually
by budding or division
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