fermentation, lactic fermentation.
vinegar, verjuice†, crab, alum; acetic acid, lactic acid.
V. be sour; sour, turn sour &c adj.; set the teeth on edge.
render sour &c adj.; acidify, acidulate.
Adj. sour; acid, acidulous, acidulated; tart, crabbed; acetous,
acetose†; acerb, acetic; sour as vinegar, sourish, acescent†, subacid
[Chem]; styptic, hard, rough.
Phr. sour as a lemon.
(4) Odor