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   /ˈæs.ɪd/ us  

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   /ˈæs.ɪd/ us  

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.
Translations of “acid”
in Korean 산…
in Arabic حامِض…
in French acide, mordant…
in Turkish asit…
in Italian acido…
in Chinese (Traditional) 化學的, 酸…
in Russian кислота…
in Polish kwas…
in Spanish ácido, mordaz, incisivo…
in Portuguese ácido…
in German sauer, beißend…
in Catalan àcid…
in Japanese 酸…
in Chinese (Simplified) 化学的, 酸…
(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

glacial

made or left by a glacier

Word of the Day

Let’s celebrate! (words and phrases for parties)

by Kate Woodford,
December 17, 2014
​​​ With Christmas and New Year almost upon us, we thought it a good time to look at the language of parties and celebrations. First, let’s start with the word ‘party’ itself. To have or throw a party or, less commonly, to give a party is to arrange a party: We’re having a

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More