1. a type of bread made with fermented dough that has a distinctive tangy flavor
2. a fermented mixture of flour and water used as a starter for making bread
3. an experienced prospector or settler, especially in Alaska or western North America
Usage: informal; historical

Examples

• The bakery is famous for its fresh sourdough bread.
• She feeds her sourdough starter every morning to keep it active.
• The sourdough has a distinctive sour taste that many people love.
• My grandmother gave me her sourdough starter that’s over fifty years old.
• The old sourdough had been mining in Alaska for thirty years.
• Fresh sourdough pairs perfectly with butter and jam.
• You need to let the sourdough rise for several hours before baking.