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English definition of “sourdough”

sourdough

noun [U] uk   /ˈsaʊə.dəʊ/ us    /ˈsaʊr.doʊ/
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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