acid definition, meaning - what is acid in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “acid”

See all translations

acid

noun uk   us   /ˈæs.ɪd/

acid noun (CHEMICAL)

B2 [C or U] any of various usually liquid substances that can react with and sometimes dissolve other materials: acetic/hydrochloric/lactic acid Vinegar is an acid.
More examples

acid noun (DRUG)

[U] slang for LSD (= an illegal drug that makes people see things that do not exist)

acid

adjective uk   us   /ˈæs.ɪd/

acid adjective (CHEMICAL)

(also acidic) containing acid, or having similar qualities to an acid: an acid taste/smell acid soil

acid adjective (UNKIND)

used to describe a remark or way of speaking that is cruel or criticizes something in an unkind way: her acid wit When she spoke her tone was acid.
(Definition of acid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of acid?
Add Cambridge dictionaries to your browser to your website

Definitions of “acid” in other dictionaries

Word of the Day

cup tie

a game between two teams trying to win a cup (= prize), especially in football

Word of the Day

What’s All The Commotion About? (Words to describe sounds)

by Kate Woodford,
May 20, 2015
​​​ In this post we look at a range of words and phrases that we use to describe noise and the absence of noise. Starting with complete quiet, we sometimes use the noun hush to describe silence: A hush fell over the room as the bride walked in./There was a deathly hush (=complete

Read More 

ancestral health noun

May 25, 2015
diet based on the presumed diet of our Palaeolithic ancestors ‘Ancestral health,’ to use a term popular among Paleo followers, has gone mass.

Read More