noun
leavening agent; yeast (for bread)
Specifically refers to a leavening agent used in bread making, such as yeast or sourdough starter.
パン種を発酵させるには、暖かい場所に置く必要がある。
To ferment the bread leavening agent, you need to place it in a warm spot.
天然酵母のパン種を使うと、独特の風味が出る。
Using a natural yeast leavening agent gives a unique flavor.