Definition of sourdough noun from the Oxford Advanced American Dictionary

 

sourdough

 noun
noun
NAmE//ˈsaʊərˌdoʊ//
 
[uncountable]
 
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dough (= a mixture of flour, fat, and water) that is left to ferment so that it has a sour taste, used for making bread; bread made with this dough
See the Oxford Advanced Learner's Dictionary entry: sourdough