sourdough

n (US) 1 [U] fermented dough mixture used in bread-making 面肥: [attrib 作定语] sourdough bread 用面肥发的面包. 2 person with long experience in pioneering or gold prospecting (in N Canada or Alaska) （加拿大北部或阿拉斯加的）垦荒老手, 探金矿的行家.

sound effect, sound-proof, sound-recording, sound-track, sound-wave, sounding, sounding-board, soundings, soundless, soundlessly, soundly, soundness, sounds, soup, soup-kitchen, soup-plate, soupcon, sour, sour cream, source, sourly, sourness, sourpuss, souse, soused, south, south (also South), South Africa, South African, South American, south-east (also ,South-East), south-easter, south-easterly, south-eastern, south-west (also ,South-West), south-wester, south-westerly, south-western, Southampton, southbound,