reagent
Low-frequencyTechnical/Scientific
Definition
Meaning
A substance used in a chemical reaction to detect, measure, examine, or produce other substances.
In a broader sense, any substance or agent used to cause a reaction or used to test for the presence of another substance.
Linguistics
Semantic Notes
Primarily a noun; strongly associated with laboratory and industrial chemistry contexts. It is not typically used in general or metaphorical senses outside of chemistry.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling and pronunciation are consistent.
Connotations
Purely technical and neutral in both varieties.
Frequency
Equally rare outside scientific contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
Reagent for (detecting/measuring) + [noun phrase]Reagent + [verb in passive] (e.g., 'The reagent was added')[Noun] + reagent (e.g., 'a chemical reagent')Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms exist for this word]”
Usage
Context Usage
Business
Used only in contexts relating to the chemical manufacturing, pharmaceutical, or laboratory supply industries.
Academic
Central term in chemistry, biochemistry, and related laboratory sciences.
Everyday
Virtually never used in everyday conversation.
Technical
The standard, precise term in all technical chemical contexts.
Examples
By Part of Speech
verb
British English
- [No common verb usage]
American English
- [No common verb usage]
adverb
British English
- [No common adverb usage]
American English
- [No common adverb usage]
adjective
British English
- [No common adjective usage]
American English
- [No common adjective usage]
Examples
By CEFR Level
- The scientist used a reagent.
- In the experiment, we added a blue reagent to the liquid.
- The purity of the reagent is critical for obtaining accurate test results.
- This novel chiral reagent facilitates asymmetric synthesis with remarkably high enantioselectivity.
Learning
Memory Aids
Mnemonic
Think: 'REActant AGENT' -> a substance that acts/reacts in a chemical process.
Conceptual Metaphor
[None commonly applied]
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'реагент' (reagent) which is a correct translation, but be aware the English word is used almost exclusively in scientific contexts, unlike the Russian word which can be used more broadly (e.g., for road salt, ice-melting chemicals).
Common Mistakes
- Misspelling as 'reagant'.
- Using it as a general synonym for 'chemical' outside of a reaction context.
- Incorrect pluralisation as 'reagences' (correct: 'reagents').
Practice
Quiz
In which field is the word 'reagent' most commonly used?
FAQ
Frequently Asked Questions
No. A reagent is consumed or undergoes change in a reaction. A catalyst speeds up a reaction without being permanently consumed.
It is highly unlikely and would sound unnatural unless you are specifically discussing chemistry.
They are often synonymous. However, 'reactant' is a more general term for any starting material in a reaction, while 'reagent' can imply a specially prepared or purified substance used for analysis or synthesis.
It is pronounced ree-AY-jent, with the stress on the second syllable.