glow plug: meaning, definition, pronunciation and examples
B2-C1Technical / Automotive
Quick answer
What does “glow plug” mean?
A small electrical heating device, used primarily in diesel engines, to preheat the combustion chamber and aid starting in cold conditions.
Audio
Pronunciation
Definition
Meaning and Definition
A small electrical heating device, used primarily in diesel engines, to preheat the combustion chamber and aid starting in cold conditions.
In broader technical contexts, any plug-like device that heats up electrically to ignite or enable a process; sometimes used analogously for anything that facilitates initiation or warming.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. British English may use "sparking plug" for petrol engines, making 'glow plug' a clearer diesel-specific term.
Connotations
Identical technical connotations.
Frequency
Slightly more frequent in British English due to the historically higher market share of diesel passenger cars, but the term is standard in both varieties.
Grammar
How to Use “glow plug” in a Sentence
The [NOUN] [VERB] the glow plug.Replace/check/test the glow plug.A glow plug for a [MAKE/MODEL] engine.Vocabulary
Collocations
Examples
Examples of “glow plug” in a Sentence
adjective
British English
- The glow-plug relay was faulty.
- Check the glow-plug controller.
American English
- The glow plug circuit is open.
- We need a glow plug socket wrench.
Usage
Meaning in Context
Business
Rare, unless in automotive parts supply or repair.
Academic
Found in engineering, thermodynamics, and automotive technology texts.
Everyday
Used by motorists, mechanics, and in DIY automotive contexts.
Technical
Primary domain of use: mechanical and automotive engineering.
Vocabulary
Synonyms of “glow plug”
Neutral
Weak
Watch out
Common Mistakes When Using “glow plug”
- Confusing 'glow plug' (diesel) with 'spark plug' (petrol).
- Misspelling as 'glo plug'.
- Using as a verb (e.g., 'The engine needs glow-plugged').
FAQ
Frequently Asked Questions
No. A glow plug heats up to aid ignition in diesel engines. A spark plug creates an electric spark to ignite fuel in petrol engines.
Yes, but with difficulty, especially in cold weather. It may cause rough idling, white smoke, and failed starts.
There's no fixed interval, but they are typically considered a maintenance item replaced every 60,000-100,000 miles or if symptoms appear.
Most modern diesel engines for cars and light vehicles do. Some large industrial or marine diesels use alternative cold-start methods.
A small electrical heating device, used primarily in diesel engines, to preheat the combustion chamber and aid starting in cold conditions.
Glow plug is usually technical / automotive in register.
Glow plug: in British English it is pronounced /ˈɡləʊ ˌplʌɡ/, and in American English it is pronounced /ˈɡloʊ ˌplʌɡ/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a plug that 'glows' with heat to help a cold engine come to life.
Conceptual Metaphor
A SPARK OF LIFE FOR A COLD BODY (the engine is a body that needs warming to become active).
Practice
Quiz
What is the primary purpose of a glow plug?