From Longman Dictionary of Contemporary Englishsourdoughsour‧dough /ˈsaʊədəʊ $ ˈsaʊrdoʊ/ noun [uncountable] DFuncooked dough (=bread mixture) that is left to ferment before being used to make bread
Examples from the Corpus
sourdough• sourdough bread• Sauerkraut provides that without the need for a sourdough culture.• There was a woman with Tropicana orange juice and sourdough bread.• Meals begin with a tall loaf of crusty sourdough bread.• Tempting as the warm, crusty sourdough bread is, go easy.• One particular strain lives only in the San Francisco Bay Area and gives the sourdough bread from that region its distinctive taste.• Anyone who has tasted the sourdough bread made in San Francisco knows about chewy, crusty bread. 