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 
    adjective
  
 Other Word Forms of Sourdough
Noun
Singular:
 sourdoughPlural:
 sourdoughsOrigin 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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