sourdough
/ˈsaʊɚˌdoʊ/noun
Middle SchoolNot in standard dictionaries
1
A type of bread dough leavened with yeast and lactobacilli that produce acids giving a sour taste.
2
An old-timer, especially in Alaska.
3
A permanent resident of the territory. Someone who has lived in the Yukon during all four seasons.
4
A 49er, a California Gold Rush miner.
5
Leaven; an agent that makes dough rise.
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#obsolete#slang