Sourdough Definition

sourdō
noun
Leaven.
Webster's New World
Sour fermented dough used as leaven in making bread.
American Heritage
Fermenting dough saved from one baking to be used for producing fermentation in a later one, thus avoiding the need for fresh yeast.
Webster's New World
Bread made with such dough.
Webster's New World
A prospector or settler in the W U.S. or Canada, esp. one living alone.
Webster's New World
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adjective

Made from dough that was leavened with yeast and lactobacteria that produce acids giving a sour taste.

Wiktionary

Other Word Forms of Sourdough

Noun

Singular:
sourdough
Plural:
sourdoughs

Origin of Sourdough

  • Sense 2, from an association with using pieces of sourdough to leaven bread in the winter

    From American Heritage Dictionary of the English Language, 5th Edition

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sourdough