资料来源 : pyDict

酵母,发酵粉

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

资料来源 : WordNet®

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