methicillin: meaning, definition, pronunciation and examples
C2Technical, Scientific, Medical
Quick answer
What does “methicillin” mean?
A synthetic penicillin derivative that was one of the first antibiotics effective against penicillinase-producing bacteria.
Audio
Pronunciation
Definition
Meaning and Definition
A synthetic penicillin derivative that was one of the first antibiotics effective against penicillinase-producing bacteria.
A semisynthetic antibiotic belonging to the penicillin group, historically used to treat infections caused by susceptible staphylococci. Its primary medical use is now largely historical due to widespread resistance, but it serves as a defining benchmark in the classification of resistant bacteria (e.g., MRSA, methicillin-resistant Staphylococcus aureus).
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences. Spelling is consistent.
Connotations
Identical technical/medical connotations.
Frequency
The word appears with essentially identical frequency in both British and American technical/medical literature.
Grammar
How to Use “methicillin” in a Sentence
The strain is methicillin-resistant.The infection was treated with methicillin.Testing for methicillin susceptibility is crucial.Vocabulary
Collocations
Examples
Examples of “methicillin” in a Sentence
adjective
British English
- The methicillin-resistant strain was isolated.
- Methicillin therapy was initiated.
American English
- The methicillin-resistant strain was identified.
- Methicillin treatment was started.
Usage
Meaning in Context
Business
Almost never used.
Academic
Used in medical, pharmaceutical, and microbiological research and history.
Everyday
Virtually never used; a patient is more likely to hear 'MRSA'.
Technical
Core term in clinical microbiology, pharmacology, and infectious disease medicine.
Vocabulary
Synonyms of “methicillin”
Neutral
Weak
Vocabulary
Antonyms of “methicillin”
Watch out
Common Mistakes When Using “methicillin”
- Mispronunciation: /miːθ-/ instead of /mɛθ-/.
- Misspelling: 'methycillin', 'methycillin'.
- Using it as a current first-line treatment recommendation.
FAQ
Frequently Asked Questions
No, methicillin itself was largely discontinued in clinical use decades ago due to side effects and the rise of resistance. However, its name remains critically important for classifying resistant bacteria like MRSA.
Methicillin is a semisynthetic derivative of penicillin. It was chemically modified to be resistant to degradation by bacterial enzymes (penicillinases) that inactivate natural penicillin.
It means the bacteria possess mechanisms (like an altered penicillin-binding protein, PBP2a) that allow them to grow and cause infection even in the presence of methicillin and all other beta-lactam antibiotics (except some newer agents specifically designed to overcome this).
This is a minor vowel reduction difference between British (with a clearer /ɪ/ sound in the third syllable) and American (with a schwa /ə/ in the third syllable) English pronunciations. Both are correct within their respective dialects.
A synthetic penicillin derivative that was one of the first antibiotics effective against penicillinase-producing bacteria.
Methicillin is usually technical, scientific, medical in register.
Methicillin: in British English it is pronounced /ˌmɛθɪˈsɪlɪn/, and in American English it is pronounced /ˌmɛθəˈsɪlɪn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: METHods to kill ILLnesses caused by bacteria with CILLIN (like penicillin).
Conceptual Metaphor
A key / benchmark (defining a major category of bacterial resistance).
Practice
Quiz
In modern clinical practice, the term 'methicillin' is most frequently used in which context?