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sourdough

noun [U]
 
 
/ˈsaʊə.dəʊ/ US  /ˈsaʊr.doʊ/

Definition

a mixture of flour and water that is left to ferment (= change in a chemical process) and then used to make bread: sourdough breadFlour and yeast
(Definition of sourdough noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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