acid
C1Technical (chemistry), Informal (slang/criticism), Formal (adjectival use).
Definition
Meaning
A chemical substance with a sour taste that reacts with metals and bases.
An adjective describing a sharp, critical, or sarcastic tone or wit; also relating to a type of music or a powerful hallucinogenic drug (LSD).
Linguistics
Semantic Notes
The word exists across scientific and metaphorical domains. In chemistry, it's precise; as an adjective for tone ('acid remark'), it's figurative; in 'acid test', it's idiomatic (a definitive, rigorous test).
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling is identical. The idiomatic use of 'acid test' is equally common in both varieties.
Connotations
Connotations are largely identical. In both, 'acid' can imply harshness or corrosiveness, literally and figuratively.
Frequency
All core and extended meanings are frequent in both dialects.
Vocabulary
Collocations
Grammar
Valency Patterns
acid + NOUN (acid rain)ADJ + acid (strong acid)VERB + acid (neutralise the acid)acid + VERB (acid corrodes)PREP + acid (battery contains acid)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “acid test”
- “pour acid on (a situation)”
Usage
Context Usage
Business
Rare, except in specific industries like chemicals or pharmaceuticals (e.g., 'The company produces citric acid'). The idiom 'acid test' is used metaphorically for a crucial evaluation.
Academic
Common in chemistry, biochemistry, environmental science (acid rain), and geology. Figurative use appears in literary criticism.
Everyday
Common in phrases like 'acid reflux', 'acid rain', and for describing a sharp taste or critical remark.
Technical
Core term in chemistry with precise definitions (pH < 7, proton donor). Also in medicine (stomach acid), music (acid jazz), and computing (acid properties in databases).
Examples
By Part of Speech
verb
British English
- The vandal attempted to acid the statue, causing significant damage.
American English
- The graffiti was removed after someone tried to acid the wall.
adverb
British English
- Not standard. Use 'acidly'.
- He replied acidly to the accusation.
American English
- Not standard. Use 'acidly'.
- She spoke acidly about her former employer.
Examples
By CEFR Level
- Vinegar contains a weak acid.
- The lemon juice tastes very acid.
- Acid rain can damage forests and lakes.
- She suffered from stomach acid after the spicy meal.
- The critic's acid review demolished the author's reputation.
- This new software is the acid test for our network's security.
- His mordant wit was often laced with an acid humour that left audiences both laughing and squirming.
- The researchers isolated the amino acid sequence responsible for the protein's function.
Learning
Memory Aids
Mnemonic
Think of a **CID** (a police officer) tasting something **A**wful and **S**our – it must be ACID!
Conceptual Metaphor
HARSH CRITICISM IS A CORROSIVE SUBSTANCE (e.g., 'Her acid wit dissolved his arguments').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'кислота' for battery acid (аккумуляторная кислота) vs. the drug LSD ('acid') which is 'ЛСД'.
- The adjective 'acidic' is more common for describing taste ('кислый') than the noun 'acid' used adjectivally.
- 'Acid test' is an idiom meaning 'решающая проверка', not a literal chemical test.
Common Mistakes
- Using 'acid' as a verb incorrectly (e.g., 'He acid the metal' – correct: 'He treated it with acid' or 'He etched it with acid').
- Confusing 'acid' (noun) with 'acidic' (adj) – 'The solution is very acid' is less common than 'The solution is very acidic'.
- Overusing the figurative sense in inappropriate technical contexts.
Practice
Quiz
In which context does 'acid' NOT refer to a chemical substance?
FAQ
Frequently Asked Questions
No, it is primarily a noun, but it is also commonly used as an adjective (e.g., acid remark, acid test). Its use as a verb is rare and typically means 'to treat or attack with acid'.
'Acid' as an adjective is often used in fixed expressions ('acid test', 'acid rain'). 'Acidic' is the more general adjective describing the properties of an acid (e.g., an acidic solution, acidic soil).
It means a definitive test that proves the value or quality of something. It originates from the use of nitric acid to test for gold.
It is formal in scientific contexts (chemistry). Its use to mean 'sarcastic' or 'harsh' is more informal, and its reference to the drug LSD is slang.