sourdough

noun

a settler or prospector (especially in western United States or northwest Canada and Alaska)
移住者、または試掘者（特に米国西部またはカナダおよびアラスカ北西部）
a leaven of dough in which fermentation is active
発酵が活発である生地の酵母

used by pioneers for making bread
パンを最初に作った人々が使った

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