The Collaborative International Dictionary of English v.0.48:

Saccharomyces \Sac`cha*ro*my"ces\, n. [NL., fr. Gr. ? sugar + ?,
   ?, a fungus.] (Biol.)
   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
   cerevisiae is the yeast of sedimentary beer. Also called
   Torula.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Torula \Tor"u*la\, n.; pl. Torulae [NL., dim. of L. torus a
   semicircular molding.] (Biol.)
   (a) A chain of special bacteria.
   (b) A genus of budding fungi. Same as Saccharomyces. Also
       used adjectively.
       [1913 Webster]