noun
yeast mash; yeast starter
In sake brewing, the mixture of steamed rice, water, and kōji mold in which yeast is cultivated before the main fermentation.
酒母は日本酒の醸造で重要な工程です。
The yeast starter is an important step in sake brewing.
杜氏が酒母の状態を毎日確認する。
The master brewer checks the condition of the yeast mash every day.