sour

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having a taste characteristic of that produced by acids; sharp, tart, or tangy.
2. adj. Made acid or rancid by fermentation.
3. adj. Having the characteristics of fermentation or rancidity; tasting or smelling of decay.
4. adj. Bad-tempered and morose; peevish: a sour temper.
5. adj. Displeased with something one formerly admired or liked; disenchanted: sour on ballet.
6. adj. Not measuring up to the expected or usual ability or quality; bad.
7. adj. Not having the correct or properly produced pitch: a sour note.
8. adj. Of or relating to excessively acid soil that is damaging to crops.
9. adj. Containing excessive sulfur compounds. Used of gasoline.
10. n. The sensation of sour taste, one of the four primary tastes.
11. n. Something sour.
12. n. A mixed drink made especially with whiskey, lemon or lime juice, sugar, and sometimes soda water.
13. v. To make or become sour.
14. v. To make or become disagreeable, disillusioned, or disenchanted.

Century Dictionary and Cyclopedia

1. Having an acid taste; sharp to the taste; tart; acid; specifically, acid in consequence of fermentation; fermented, and thus spoiled: as, sour bread; sour milk.
2. Harsh of temper; crabbed; peevish; austere; morose: as, a man of a sour temper.
3. Afflictive; hard to bear; bitter; disagreeable to the feelings; distasteful in any manner.
4. Expressing discontent, displeasure, or peevishness: as, a sour word.
5. Cold; wet; harsh; unkindly to crops: said of soil.
6. Coarse: said of grass.
7. Synonyms Acetous, acetose.
8. 2 and
9. Cross, testy, waspish, snarling, cynical.
10. n. Something sour or acid; something bitter or disagreeable.
11. n. Dirt; filth.
12. n. An acid punch.
13. n. In bleaching and dyeing:
14. n. A bath of buttermilk or sour milk, or of soured bran or rye-flour, used by primitive bleachers.
15. n. A weak solution of sulphuric or hydrochloric acid, used for various purposes. Compare souring, 5.
16. To become sour; become acid; acquire the quality of tartness or pungency to the taste, as by fermentation: as, cider sours rapidly in the rays of the sun.
17. To become peevish, crabbed, or harsh in temper.
18. To become harsh, wet, cold, or unkindly to crops: said of soil.
19. To make sour; make acid; cause to have a sharp taste, especially by fermentation.
20. To make harsh, crabbed, morose, or bitter in temper; make cross or discontented; embitter; prejudice.
21. To make harsh, wet, cold, or unkindly to crops: said of soil.
22. In bleaching, etc., to treat with a dilute acid.
23. To macerate and render fit for plaster or mortar, as lime.
24. Sourly; bitterly.
25. n. In drenching or puering skins, the old liquor which has become sour or turned.

Wiktionary

1. adj. Having an acidic, sharp or tangy taste.
2. adj. Made rancid by fermentation, etc.
3. adj. Tasting or smelling rancid.
4. adj. Peevish or bad-tempered.
5. adj. of soil Excessively acidic and thus infertile.
6. adj. of petroleum Containing excess sulfur.
7. adj. Unfortunate or unfavorable.
8. n. The sensation of a sour taste.
9. n. A drink made with whiskey, lemon or lime juice and sugar.
10. n. by extension Any cocktail containing lemon or lime juice.
11. v. To make or become sour.
12. v. To become disenchanted.

GNU Webster's 1913

1. adj. Having an acid or sharp, biting taste, like vinegar, and the juices of most unripe fruits; acid; tart.
2. adj. Changed, as by keeping, so as to be acid, rancid, or musty, turned.
3. adj. Disagreeable; unpleasant; hence; cross; crabbed; peevish; morose.
4. adj. Afflictive; painful.
5. adj. Cold and unproductive
6. n. A sour or acid substance; whatever produces a painful effect.
7. v. To cause to become sour; to cause to turn from sweet to sour.
8. v. To make cold and unproductive, as soil.
9. v. To make unhappy, uneasy, or less agreeable.
10. v. To cause or permit to become harsh or unkindly.
11. v. To macerate, and render fit for plaster or mortar.
12. v. To become sour; to turn from sweet to sour

WordNet 3.0

1. n. a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar
2. adj. having a sharp biting taste
3. v. go sour or spoil
4. adj. smelling of fermentation or staleness
5. adj. inaccurate in pitch
6. adj. in an unpalatable state
7. adj. showing a brooding ill humor
8. n. the taste experience when vinegar or lemon juice is taken into the mouth
9. n. the property of being acidic
10. adj. one of the four basic taste sensations; like the taste of vinegar or lemons
11. v. make sour or more sour