Saccharomyces

noun

1. Any of several single-celled yeasts belonging to the genus Saccharomyces that lack hyphae and ferment sugar.
2. A genus of minute saprophytic fungi; the yeast-fungi.
3. A genus of budding fungi, the various species of which have the power, to a greater or less extent, or splitting up sugar into alcohol and carbonic acid. They are the active agents in producing fermentation of wine, beer, etc. Saccharomyces cerevisiæ is the yeast of sedimentary beer. Also called Torula.
4. Any of many single-celled fungi of the genus Saccharomyces, that lack a true mycelium; especially the yeasts
5. single-celled yeasts that reproduce asexually by budding; used to ferment carbohydrates