закваска

Noun

 * 1) leaven, ferment, barm
 * 2)  mold
 * 3)  stuff
 * 1)  stuff

Etymology
From.

Noun

 * 1) ferment, starter, fermentation starter, barm
 * 2)  sourdough starter, starter dough, levain
 * 3)  mould/mold