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yeast    音标拼音: [j'ist]
n. 酵母,发酵粉

酵母,发酵粉

yeast
n 1: a commercial leavening agent containing yeast cells; used
to raise the dough in making bread and for fermenting beer
or whiskey [synonym: {yeast}, {barm}]
2: any of various single-celled fungi that reproduce asexually
by budding or division

Yeast \Yeast\, n. [OE. [yogh]eest, [yogh]est, AS. gist; akin to
D. gest, gist, G. gischt, g[aum]scht, OHG. jesan, jerian, to
ferment, G. gischen, g[aum]schen, g[aum]hren, Gr. ? boiled,
zei^n to boil, Skr. yas. [root]111.]
[1913 Webster]
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.
[1913 Webster]

2. Spume, or foam, of water.
[1913 Webster]

They melt thy yeast of waves, which mar
Alike the Armada's pride, or spoils of Trafalgar.
--Byron.
[1913 Webster]
[1913 Webster]

{Yeast cake}, a mealy cake impregnated with the live germs of
the yeast plant, and used as a conveniently transportable
substitute for yeast.

{Yeast plant} (Bot.), the vegetable organism, or fungus, of
which beer yeast consists. The yeast plant is composed of
simple cells, or granules, about one three-thousandth of
an inch in diameter, often united into filaments which
reproduce by budding, and under certain circumstances by
the formation of spores. The name is extended to other
ferments of the same genus. See {Saccharomyces}.

{Yeast powder}, a baling powder, -- used instead of yeast in
leavening bread.
[1913 Webster]



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