methyl red: meaning, definition, pronunciation and examples
Very lowTechnical/Scientific
Quick answer
What does “methyl red” mean?
A chemical compound used as a pH indicator in laboratory tests.
Audio
Pronunciation
Definition
Meaning and Definition
A chemical compound used as a pH indicator in laboratory tests.
A synthetic azo dye primarily used in microbiology for the Methyl Red (MR) test to identify enteric bacteria based on their pattern of glucose fermentation and acid production.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or spelling. Pronunciation of 'methyl' may have a slightly softer /t/ in some British accents.
Connotations
Neutral scientific term in both varieties.
Frequency
Equally rare outside of laboratory and academic settings in both regions.
Grammar
How to Use “methyl red” in a Sentence
[The] methyl red test [is/was] performed on [sample][Subject] added methyl red to [solution]Vocabulary
Collocations
Examples
Examples of “methyl red” in a Sentence
adjective
British English
- The methyl-red test result was conclusive.
- We followed the methyl-red protocol.
American English
- The methyl red test result was clear.
- We used the methyl red procedure.
Usage
Meaning in Context
Business
Not used.
Academic
Commonly referenced in chemistry, biochemistry, and microbiology textbooks and research papers detailing analytical techniques.
Everyday
Virtually never used in everyday conversation.
Technical
Standard term in laboratory protocols for microbiology identification (e.g., IMViC tests) and in chemistry for pH titration experiments.
Vocabulary
Synonyms of “methyl red”
Neutral
Weak
Watch out
Common Mistakes When Using “methyl red”
- Using 'methyl red' as an adjective without a noun (e.g., 'The solution is methyl red' is incorrect; say 'The solution contains methyl red' or 'It is a methyl red solution').
- Misspelling as 'methyl read'.
- Incorrectly capitalising as 'Methyl Red' outside of the specific test name ('Methyl Red test' is correct).
FAQ
Frequently Asked Questions
Methyl red turns a distinct red colour in acidic conditions (pH below 4.4).
Like many laboratory chemicals, methyl red should be handled with care, using appropriate personal protective equipment as it can be harmful if ingested or inhaled.
It is not recommended for home use, as it is a specialised chemical reagent requiring proper laboratory knowledge, safety measures, and disposal protocols.
It indicates that the bacterium being tested produces large, stable amounts of acid from glucose fermentation, characteristic of organisms like Escherichia coli.
A chemical compound used as a pH indicator in laboratory tests.
Methyl red is usually technical/scientific in register.
Methyl red: in British English it is pronounced /ˌmiːθaɪl ˈrɛd/, and in American English it is pronounced /ˌmɛθəl ˈrɛd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a little red METHYL (metal) robot turning red when it finds acid, like a traffic light stopping (red) for danger (acidity).
Conceptual Metaphor
A SENTINEL or TRAFFIC LIGHT for acidity, signalling a state change.
Practice
Quiz
What is the primary function of methyl red in a laboratory setting?