Yeast



GRE

解释

GRE 红宝书

• n.酵母, 兴奋

Webster Collegiate

I. noun

• Etymology: Middle English yest, from Old English gist; akin to Old High German jesen, gesen to ferment, Greek zein to boil
• Date: before 12th century
• 1.
  • a. a yellowish surface froth or sediment that occurs especially in saccharine liquids (as fruit juices) in which it promotes alcoholic fermentation, consists largely of cells of a fungus (as the saccharomyces, Saccharomyces cerevisiae), and is used especially in the making of alcoholic liquors and as a leaven in baking
  • b. a commercial product containing yeast fungi in a moist or dry medium
  • c.
    • (1) a unicellular fungus that is present and functionally active in yeast, usually has little or no mycelium, and reproduces by budding
    • (2) any of various similar fungi
• 2. archaic the foam or spume of waves
• 3. something that causes ferment or activity <were all seething with the yeast of revolt — J. F. Dobie>

II. intransitive verb

• Date: 1819
• ferment, froth

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