Meaning of ACID in English

I. ˈa-səd adjective

Etymology: French or Latin; French acide, from Latin acidus, from acēre to be sour — more at acet-

Date: 1626


a. : sour, sharp, or biting to the taste

b. : sharp, biting, or sour in manner, disposition, or nature

an acid individual

c. : sharply clear, discerning, or pointed

an acid wit

d. : piercingly intense and often jarring

acid yellow


a. : of, relating to, or being an acid ; also : having the reactions or characteristics of an acid

acid soil

an acid solution

b. of salts and esters : derived by partial exchange of replaceable hydrogen

acid sodium carbonate NaHCO 3

c. : containing or involving the use of an acid (as in manufacture)

d. : marked by or resulting from an abnormally high concentration of acid

acid indigestion

3. : relating to or made by a process (as in making steel) in which the furnace is lined with acidic material and an acidic slag is used

4. : rich in silica

acid rocks

• ac·id·ly adverb

• ac·id·ness noun

II. noun

Date: 1696

1. : a sour substance ; specifically : any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt, redden litmus, and have a pH less than 7, that are hydrogen-containing molecules or ions able to give up a proton to a base, or that are substances able to accept an unshared pair of electrons from a base

2. : something incisive, biting, or sarcastic

a social satire dripping with acid

3. : LSD

• ac·idy ˈa-sə-dē adjective

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.