sourdough

noun
🔊/ˈsaʊədəʊ/
🔊/ˈsaʊərdəʊ/
[uncountable]
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  1. dough (= a mixture of flour and water) that is left to ferment so that it has a sour taste, used for making bread; bread made with this dough酸面团;发面面包Topics Foodc2
    Oxford Collocations DictionarySourdough is used before these nouns:
    • bread
    See full entry