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Yeast

Yeast is the fermentation work-horse. This single-cell organism, among other things, converts sugar in contained within in a grape into alcohol and carbon dioxide. While some winemakers rely on native or wild yeast for fermentation, most use commercially produced yeasts specifically designed for various winemaking styles.

Yeasty

The term "yeasty" is used to describe the fresh-baked bread bouquet that wines can acquire through sur lie fermentation. Like so many other wine flavors and aromas, in proper proportions, the yeasty aroma benefits a wine, but is a fault if in excess.