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Meaning of sourdough

sour•dough

Pronunciation: (sour'dō", sou'ur-), [key]
— n.
  1. leaven, esp. fermented dough retained from one baking and used, rather than fresh yeast, to start the next.
  2. a prospector or pioneer, esp. in Alaska or Canada.
  3. any longtime resident, esp. in Alaska or Canada.
—adj.
  1. leavened with sourdough: sourdough bread.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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