Roget's Thesaurus: Entry 397 (Sourness)

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#397. Sourness. -- N. sourness &c. adj.; acid, acidity, low pH; acetous fermentation, lactic fermentation.

vinegar, verjuice[obs], 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[obs]; acerb, acetic; sour as vinegar, sourish, acescent[obs], subacid[Chem]; styptic, hard, rough.

Phr. sour as a lemon.