sourdough
noun
sour·dough
ˈsau̇(-ə)r-ˌdō
sense 1 is also -ˈdō
1
: a leaven consisting of dough in which fermentation is active
2
[from the use of sourdough for making bread in prospectors' camps]
: a veteran inhabitant and especially an old-time prospector of Alaska or northwestern Canada
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Merriam-Webster unabridged
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