acid

Pronunciation

• IPA ^(key): /ˈæs.ɪd/

• Audio (US)

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Noun

Singular acid

Plural acids

1. (countable) (chemistry) An acid is a liquid with a high number of hydrogen ions in it that can burn things.
   • Antonyms: alkaline and base

   Fruit often has a little acid in it.

   The acid burned the table.

   Acids taste sour but bases taste bitter.

Related words

• acidic
• acidly
• acidity

Adjective

Positive acid

Comparative more acid

Superlative most acid

1. If something is acid, it is like an acid, from an acid, or acidic.
   • Synonyms: acidic, harsh and caustic
   • Antonyms: base and basic

   The factories nearby have made the lake more acid.

2. If something has an acid taste, it is sour.
   • Synonyms: tart and bitter
   • Antonym: sweet
3. (figurative) If something said or done to you was acid, it was hurtful.
   • Synonyms: sharp, hurtful and critical
   • Antonyms: pleasant and constructive

   Their acid comments are painful.

Related words

• chemistry
• periodic table
• taste
• pH