sourdough

• POS: Adjective, Noun
• HYPHEN: sour=dough

OXFORD DICTIONARY

sourdough, n. US 1 fermenting dough, esp. that left over from a previous baking, used as leaven.
2 an old-timer in Alaska etc.

Etymology

dial., = leaven, in allusion to piece of sour dough for raising bread baked in winter

THESAURUS

sourdough

acid, acidulant, bread-and-butter pickle, butty, chokecherry, collier, crab apple, desert rat, dill pickle, driller, gold digger, gold miner, gold panner, green apple, lemon, lime, miner, mineworker, pickle, prospector, sour, sour balls, sour cream, sour grapes, sour pickle, verjuice, vinegar, yogurt