acid
[adjective]
Synonyms:
- sour, acerbic, acrid, pungent, tart, vinegary
- sharp, biting, bitter, caustic, cutting, harsh, trenchant, vitriolic

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Antonyms: sweet, alkaline, basic
Contrasted words: bland, mild, neutral

[TahlilGaran] English Synonym Dictionary ▲

I. ac‧id¹ W3 /ˈæsəd, ˈæsɪd/ noun

1. [uncountable and countable] a chemical substance that has a pH of less than 7. Strong acids can burn holes in material or damage your skin:
sulphuric acid

2. [uncountable] informal the drug LSD

[TahlilGaran] Dictionary of Contemporary English ▲

II. acid² adjective
[Date: 1600-1700; Language: French; Origin: acide, from Latin acidus, from acere 'to be sour']

1. having a sharp sour taste Synonym : bitter:
a juicy apple with a slightly acid flavour

2. acid remark/comment/tone etc an acid remark uses humour in an unkind way to criticize someone:
I was expecting another of his acid remarks, but he remained silent.

3. the acid test a way of finding out whether something is as good as people say it is, whether it works, or whether it is true:
People ask if the team is good enough. This match will be the acid test.

4. technical an acid soil does not contain much lime¹(3):
Blueberry bushes need a very acid soil.
—acidity /əˈsɪdəti, əˈsɪdɪti/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲

acid
noun
I. chemical compound
ADJ. concentrated, strong | dilute, weak | acetic, amino, carbolic, citric, folic, hydrochloric, lactic, nitric, nucleic, prussic, sulphuric, etc.
VERB + ACID produce | neutralize You will need a special chemical to neutralize the acid.
ACID + VERB burn sth The acid burned a hole in her overalls.

[TahlilGaran] Collocations Dictionary ▲

acid
II. illegal drug
VERB + ACID drop smoking joints and dropping acid
 ⇒ Note at DRUG

[TahlilGaran] Collocations Dictionary ▲