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Definitions

spark plug

NOUN
device that ignites fuel in engine
Synonyms
WEAK
ball of fire detonator fuse human dynamo ignition system sparker

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The spark plug ignites a fuel-air mix, causing the rotor to turn a shaft, creating motion.

From The Wall Street Journal • Apr. 24, 2026

The spark plug ignites a fuel-air mix, causing the rotor to turn a shaft, creating motion.

From The Wall Street Journal • Apr. 24, 2026

That caused a short-circuit and "arcing" - electric sparks like those in a spark plug - which resulted in a "catastrophic failure".

From BBC • Jul. 2, 2025

Meanwhile, tune-ups, oil changes and spark plug replacements are now things of the past at the South Pasadena Police Department.

From Los Angeles Times • Jul. 30, 2024

My father bought a new spark plug for the mower.

From "Crash" by Jerry Spinelli