"acid" Definition

Definitions for the word "acid" from multiple English dictionaries.

1. a.
Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered.
Source: The 1913 Webster Unabridged Dictionary, 1913
2. a.
Of or pertaining to an acid; as, acid reaction.
Source: The 1913 Webster Unabridged Dictionary, 1913
3. n.
A sour substance.
Source: The 1913 Webster Unabridged Dictionary, 1913
4. n.
One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids.
Source: The 1913 Webster Unabridged Dictionary, 1913
5. n.
1 a any of a class of substances that liberate hydrogen ions in water, are usu. Sour and corrosive, turn litmus red, and have a ph of less than 7. B any compound or atom donating protons. 2 any sour substance. 3 slang the drug lsd. adj. 1 sour. 2 biting, sharp (an acid wit). 3 chem. Having the essential properties of an acid. acidic adj. Acidify v. (-ies, -ied). Acidity n. Acidly adv. [latin aceo be sour]
Source: Oxford English Dictionary, 1884

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