Pronunciation: (souur'dō", sou'ur-), [key]
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.
leavened with sourdough: sourdough bread.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.