sour·dough
noun/ˈsaʊədəʊ/
/ˈsaʊərdəʊ/
[uncountable]- 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 Oxford Collocations DictionarySourdough is used before these nouns:- bread