cholinesterase: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “cholinesterase” mean?
An enzyme that breaks down the neurotransmitter acetylcholine into choline and acetic acid, terminating its action at synaptic junctions.
Audio
Pronunciation
Definition
Meaning and Definition
An enzyme that breaks down the neurotransmitter acetylcholine into choline and acetic acid, terminating its action at synaptic junctions.
In broader biomedical contexts, it refers to any enzyme from a family that hydrolyses choline-based esters; crucial for proper nervous system function and a target for certain drugs (e.g., nerve agents, Alzheimer's treatments) and pesticides.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or usage differences. Pronunciation differs slightly (see IPA).
Connotations
Neutral technical term in both varieties.
Frequency
Equally rare in general discourse but standard in relevant scientific fields in both regions.
Grammar
How to Use “cholinesterase” in a Sentence
[Subject] inhibits cholinesterase.Cholinesterase breaks down [Object].[Measurement] of cholinesterase activity.Exposure to [Agent] lowers cholinesterase.Vocabulary
Collocations
Examples
Examples of “cholinesterase” in a Sentence
noun
British English
- The clinician ordered a serum cholinesterase test to assess possible organophosphate exposure.
- Research focuses on how cholinesterase activity declines in certain neurodegenerative conditions.
American English
- The vet diagnosed the dog's illness as cholinesterase inhibitor poisoning from pest control products.
- A key finding was significantly depressed red blood cell cholinesterase.
Usage
Meaning in Context
Business
Virtually never used, except in pharmaceutical/agrochemical company reports.
Academic
Standard in life science, medical, and pharmacology papers and textbooks.
Everyday
Extremely rare. Might appear in news articles about pesticide poisoning or Alzheimer's drug research.
Technical
The primary register. Used precisely in lab reports, clinical diagnoses (e.g., organophosphate toxicity), and research.
Vocabulary
Synonyms of “cholinesterase”
Strong
Neutral
Weak
Vocabulary
Antonyms of “cholinesterase”
Watch out
Common Mistakes When Using “cholinesterase”
- Mispronunciation: stressing the first syllable (*'CHO-lin-es-terase'). Correct stress is on 'nes' (/ˌkəʊ.lɪˈnɛs.tə.reɪz/).
- Confusing 'cholinesterase' (the enzyme) with 'acetylcholine' (the neurotransmitter it breaks down).
- Using it as a countable noun without specification (e.g., 'a cholinesterase' is vague; better: 'a cholinesterase inhibitor' or 'acetylcholinesterase').
FAQ
Frequently Asked Questions
Not exactly. 'Cholinesterase' is a general term for enzymes that hydrolyse choline esters. 'Acetylcholinesterase' (AChE) is a specific, highly efficient type found mainly in synapses. 'Butyrylcholinesterase' (BChE or pseudocholinesterase) is another type found in blood plasma.
Its activity is a key biomarker for exposure to organophosphate pesticides and nerve agents. Also, drugs that mildly inhibit it (cholinesterase inhibitors) are used to treat symptoms of Alzheimer's disease and myasthenia gravis by boosting acetylcholine levels.
High levels are rarely discussed. Low levels are clinically significant: acquired low levels indicate toxin exposure; congenital deficiency of pseudocholinesterase causes sensitivity to certain muscle relaxants used in surgery.
No. It is a highly specialised term familiar only to those in relevant scientific, medical, or military fields. The average speaker would not know it or use it.
An enzyme that breaks down the neurotransmitter acetylcholine into choline and acetic acid, terminating its action at synaptic junctions.
Cholinesterase is usually technical/scientific in register.
Cholinesterase: in British English it is pronounced /ˌkəʊ.lɪˈnɛs.tə.reɪz/, and in American English it is pronounced /ˌkoʊ.lɪˈnɛs.tə.reɪs/ or /ˌkoʊ.lɪˈnɛs.tə.reɪz/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: CHOLINE (the neurotransmitter part) + ESTER (type of chemical bond) + -ASE (enzyme suffix). So, it's the 'choline-ester-ase' enzyme.
Conceptual Metaphor
THE NERVOUS SYSTEM'S OFF-SWITCH or THE CHEMICAL DEMOLITION CREW FOR SIGNALS.
Practice
Quiz
What is the primary functional result of cholinesterase inhibition?