Meaning of “sourdough” in the English Dictionary

british dictionary

"sourdough" in British English

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sourdoughnoun [ 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 bread

(Definition of “sourdough” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)