sourdough has definitions from the fields of work,mining
1
[ noun ] a leaven of dough in which fermentation is active; used by pioneers for making bread

Used in print

(T. C. McClary, "The Flooded Desert," Argosy,...)

He poured the water off the sourdough and off the flour , salvaging the chunky , watery messes for biscuits of a sort .

Related terms

leaven

2
[ adjective ] leavened with a small amount of fermented dough

Examples

"sourdough bread"

Used in print

(Joseph Chadwick, No Land Is Free....)

He was readying a batch of sourdough biscuits for the Dutch_oven .

Related terms

leavened

3
[ noun ] (work,mining) a settler or prospector (especially in western United States or northwest Canada and Alaska)

Related terms

settler prospector West

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