Meaning of “acid” in the English Dictionary

"acid" in British English

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acidnoun

uk /ˈæs.ɪd/ 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

  • Nitric acid will dissolve most animal tissue.
  • Pour exactly 100 ml of sulphuric acid into a measuring cylinder.
  • Below pH 6.5 is acid, above pH 7.5 is alkaline.
  • phosphoric acid
  • a highly corrosive acid

acidadjective

uk /ˈæs.ɪd/ us /ˈæs.ɪd/

(Definition of “acid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"acid" in American English

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acidnoun [ C/U ]

us /ˈæs·ɪd/

chemistry any of various chemical substances that can produce salts, some of which are able to damage whatever they touch

acidadjective

us /ˈæs·ɪd/

sour in taste:

The salad dressing has an acid taste.

fig. An acid comment/remark is something said or written in strong criticism.

(Definition of “acid” from the Cambridge Academic Content Dictionary © Cambridge University Press)