A a


    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [as-id]
    • /ˈæs ɪd/
    • /ˈæsɪd/
    • US Pronunciation
    • US IPA
    • [as-id]
    • /ˈæs ɪd/

Definitions of acid word

  • variable noun acid An acid is a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with. 3
  • adjective acid An acid substance contains acid. 3
  • graded adjective acid An acid fruit or drink has a sour or sharp taste. 3
  • graded adjective acid An acid remark, or acid humour, is very unkind or critical. 3
  • uncountable noun acid The drug LSD is sometimes referred to as acid. 3
  • noun acid any substance that dissociates in water to yield a sour corrosive solution containing hydrogen ions, having a pH of less than 7, and turning litmus red 3

Information block about the term

Origin of acid

First appearance:

before 1620
One of the 42% oldest English words
1620-30; < Latin acidus sour, akin to ācer sharp, acētum vinegar, acescent, acicula

Historical Comparancy

Parts of speech for Acid


acid popularity

A common word. It’s meaning is known to most children of preschool age. About 98% of English native speakers know the meaning and use the word.
Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

acid usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for acid

adj acid

  • biting — Biting wind or cold is extremely cold.
  • pungent — sharply affecting the organs of taste or smell, as if by a penetrating power; biting; acrid.
  • acerbic — sour in taste
  • piquant — agreeably pungent or sharp in taste or flavor; pleasantly biting or tart: a piquant aspic.
  • sharp — having a thin cutting edge or a fine point; well-adapted for cutting or piercing: a sharp knife.

noun acid

  • hallucinogen — a substance that produces hallucinations.
  • candy — Candy is sweet foods such as toffees or chocolate.
  • dot — a female given name, form of Dorothea and Dorothy.
  • blotter — A blotter is a large sheet of blotting paper kept in a special holder on a desk.
  • green dragon — a mythical monster generally represented as a huge, winged reptile with crested head and enormous claws and teeth, and often spouting fire.

adjective acid

  • acidic — Acidic substances contain acid.
  • sour — having an acid taste, resembling that of vinegar, lemon juice, etc.; tart.
  • bitter — In a bitter argument or conflict, people argue very angrily or fight very fiercely.
  • critical — A critical time, factor, or situation is extremely important.
  • barbed — A barbed remark or joke seems polite or humorous, but contains a cleverly hidden criticism.

Antonyms for acid

adj acid

  • basic — You use basic to describe things, activities, and principles that are very important or necessary, and on which others depend.
  • kind — of a good or benevolent nature or disposition, as a person: a kind and loving person.
  • bland — If you describe someone or something as bland, you mean that they are rather dull and unexciting.
  • mild — amiably gentle or temperate in feeling or behavior toward others.
  • dull — not sharp; blunt: a dull knife.

Top questions with acid

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See also

Matching words

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